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Ergonomics is the science of fitting work to the human being, not the other way around. It rests on three inseparable elements. The person, with their physical capabilities and limitations. The machine, meaning the tools, equipment, and workstations they use. And the environment, the light, noise, temperature, and air in which the work happens.
A well-designed tool still fails in a poorly lit space. The strongest worker is still injured by a badly designed task. When the fit between these three is right, work is Safe and Sustainable. When it is wrong, the cost is written slowly into the bodies of the people doing the work.
To evaluate this fit, ergonomics has developed a wide and ever-expanding set of assessment tools and methodologies. These cover posture, force, repetition, vibration, thermal stress, and the cognitive and psychosocial dimensions of work. Each was built to make an invisible risk measurable.
The glossary below brings together some of the most widely recognised of these tools, used by ergonomics consultants and EHS teams worldwide. It is not exhaustive, the field keeps evolving, but it offers a clear, practical foundation for EHS professionals, safety officers, HR leaders, and anyone seeking to understand the science behind the ergonomics work ErgoTattva does for clients across India and internationally.
3DSSPP
Three-Dimensional Static Strength Prediction Program
3DSSPP is a biomechanical analysis software — used to calculate the spinal compressive forces and the percentage of the working population capable of performing a specific manual handling task without exceedin g strength limits. The programme models the human body as a series of rigid links and calculates the static forces acting on the spine and joints during a defined posture and load condition — producing predictions of lumbar compressive force, shear force, and joint moments alongside population strength capability data. 3DSSPP is widely used by ergonomists and industrial engineers to evaluate and redesign manual handling tasks, workstation heights, and tool designs — providing a quantitative biomechanical ba sis for ergonomic decision -making.
ACGIH TLV for Hand Activity
American Conference of Governmental Industrial Hygienists — Threshold Limit Value for Hand Activity Level
The ACGIH TLV for Hand Activity is an internationally recognised guideline that defines safe exposure limits for repetitive hand and wrist activity — establishing the threshold below which nearly all workers can perform repetitive tasks without developing musculoskeletal disorders of the hand, wrist, and forearm. The assessment is based on two variables — Hand Activity Level, which rates the frequency and effort of hand and wrist motion on a scale of zero to ten, and Normalised Peak Hand Force, which expresses peak force as a proportion of maximum grip strength. These values are plotted against the ACGIH action limit and TLV curves to classify risk and guide corrective action. It is updated periodically as part of the annual TLV and BEI documentation.
Anthropometric Data — Indian Workforce Reference
Anthropometric Database for Indian Population
Anthropometry is the scientific measurement of the human body — its dimensions, proportions, and physical characteristics — used in ergonomics to ensure that workstations, tools, equipment, and environments are designed to fit the actual physical characteristics of the people who use them. Indian workers differ significantly in body dimensions from the Western populations on which most international ergonomic standards and furniture specifications are based — making Indian-specific anthropometric data essential for accurate ergonomic design in the Indian context. Key reference sources include the National Institute of Design anthropometric database, NEERI studies, and sector-specific surveys covering standing and sitting heights, reach distances, grip dimensions, and strength data across Indian male and female worker populations.
BIS Ergonomics Standards
Bureau of Indian Standards — Ergonomics Standards
The Bureau of Indian Standards has developed a range of Indian Standards relevant to ergonomics and workplace design — covering office furniture dimensions, workstation requirements, lighting standards, noise exposure limits, and manual handling guideline s applicable to Indian workplaces. Key standards include IS 7328 for office furniture ergonomics, IS 3483 for workplace lighting, and various product-specific standards that define ergonomic requirements for equipment used in Indian industry. While interna tional standards such as ISO and EN are widely referenced, BIS standards provide the regulatory baseline for ergonomics compliance in Indian workplaces — and knowledge of applicable BIS standards is essential for any ergonomics assessment conducted in the Indian regulatory context.
BRIEF
Baseline Risk Identificat ion of Ergonomic Factors
BRIEF is a rapid ergonomic screening tool — designed to quickly identify body parts at risk of musculoskeletal disorder in industrial and manufacturing workstations. The tool evaluates six body regions — wrists, elbows, shoulders, neck, back, and legs — against four
Borg RPE Scale
Borg Rating of Perceived Exertion Scale
The Borg RPE Scale is a validated psychophysical tool used to measure a worker's subjective perception of physical effort during a task — providing a quantified measure of how hard the body is working as perceived by the person performing it. The scale runs from six to twenty — with verbal anchors ranging from no exertion at all to maximal exertion — and correlates closely with objective physiological measures including heart rate and oxygen consumption. In ergonomics, the Borg RPE is used to assess the physical demand of manual handling tasks, evaluate fatigue during repetitive work, and monitor worker response to ergonomic interventions over time.
CAESAR
Civilian American and European Surface Anthropometry Resource
CAESAR is a large-scale anthropometric database providing three-dimensional body scan data for civilian adult populations across the United States and Europe. It contains detailed body surface measurements, landmarks, and functional reach data for thousands of individuals — making it one of the most comprehensive anthropometric references available for product and workplace design. In ergonomics practice, CAESAR data is used to inform workstation design, vehicle interior design, protective equipment sizing, and any application where the fit between a designed environment and the human body must be validated across a wide range of body sizes.
CTD Risk Index
Cumulative Trauma Disorder Risk Index
The Cumulative Trauma Disorder Risk Index is an ergonomic assessment framework used to evaluate the cumulative phy sical stress placed on the musculoskeletal system through repeated exposure to multiple ergonomic risk factors — including repetition, force, awkward posture, vibration, contact stress, and cold temperatures. Unlike single -variable assessment tools, the CT D Risk Index recognises that musculoskeletal disorders typically result from the combined effect of several risk factors acting simultaneously — and that the interaction between these factors can produce greater risk than any individual factor alone. It is used to assess complex tasks where multiple risk factors are present and a single -dimension tool would underestimate the overall risk.
Copenhagen Psychosocial Questionnaire — COPSOQ
Copenhagen Psychosocial Questionnaire
The Copenhagen Psychosocial Questionnaire is a validated, internationally recognised survey instrument — designed to measure the psychosocial working conditions and psychological wellbeing of employees across a wide range of workplace settings. COPSOQ covers dimensions including work demands, work organisation, interpersonal relations at work, work -individual interface, and health and wellbeing — providing a comprehensive picture of the psych osocial risk factors present in an organisation. It is available in short, medium, and long versions — making it suitable for rapid screening and in -depth research alike — and has been validated across multiple countries and industries.
DORTMUND Approach
Dortmund Approach for Assessment of Load Handling
The Dortmund Approach is a biomechanically grounded method for assessing the spinal load associated with manual load handling tasks. The method calculates the compressive force on the lumbar spine — specific ally the L4/L5 intervertebral disc — during lifting, lowering, holding, and carrying tasks, using biomechanical models that account for load weight, handling distance, posture, and the frequency and duration of exposure. The Dortmund Approach is particular ly valued for its ability to provide an absolute measure of spinal load — expressed in Newtons — that can be compared against established biomechanical tolerance limits for the lumbar spine.
DSE Assessment Framework
Display Screen Equipment Assessment Framework
The DSE Assessment Framework is a structured approach to evaluating the ergonomic adequacy of workstations used with display screen equipment — covering the physical setup of the screen , keyboard, mouse, chair, desk, lighting, and the work environment, alongside the work patterns and individual characteristics of the DSE user. Originating from the European Union's Display Screen Equipment Directive — which has been widely adopted and ada pted across jurisdictions — the framework requires employers to assess the risks posed by DSE use and implement controls to reduce those risks. In India, DSE assessment is increasingly expected by multinational employers, institutional investors, and ESG f rameworks as a standard component of occupational health management for office -based workforces.
Digital Human Modelling — DHM
Digital Human Modelling
Digital Human Modelling is a computer -aided ergonomics technique that uses three-dimensional virtual human figures — populated with anthropometric data — to simulate and evaluate how workers of different body sizes interact with wor kstations, vehicles, equipment, and environments before physical prototypes are built or facilities are constructed. DHM software — including tools such as JACK, RAMSIS, and DELMIA Ergonomics — allows ergonomists to test reach envelopes, posture profiles, visibility, and physical demand of proposed designs in a virtual environment — identifying and resolving ergonomic problems at the design stage where changes are least expensive to implement. DHM is increasingly used in automotive, aerospace, manufacturing , and construction design — reducing the need for costly physical mock -ups and enabling ergonomic optimisation before construction or production begins.
EAV & ELV
Exposure Action Value & Exposure Limit Value — Vibration
take action and the absolute limits that must not be exceeded. The EAV is the level at which employers must begin to reduce exposure and provide health surveillance — the ELV is the maximum permissible daily exposure. Thes e values are expressed in metres per second squared — m/s² — and are calculated as an eight-hour energy -equivalent exposure — A(8) — accounting for both the vibration magnitude and the duration of exposure.
Fatigue Risk Management System — FRMS
Fatigue Risk Management System
A Fatigue Risk Management System is a structured, data -driven approach to identifying, assessing, and controlling the risks arising from worker fatigue — recognising that fatigue is a significant occupational hazard that impairs cognitive function, slows r eaction time, increases error rates, and contributes to workplace accidents, particularly in safety -critical roles and industries with shift work, extended hours, or physically demanding tasks. FRMS frameworks — developed by organisations including the Int ernational Civil Aviation Organisation, rail safety regulators, and occupational health bodies — combine biomathematical fatigue modelling, worker fatigue reporting systems, scheduling controls, and workplace monitoring to manage fatigue risk systematicall y rather than reactively.
HAL — Hand Activity Level
Hand Activity Level
Hand Activity Level is a validated ergonomic measure used in co njunction with Normalised Peak Hand Force to assess the risk of upper limb musculoskeletal disorders in tasks involving repetitive hand and wrist activity. HAL is rated on a scale of zero to ten based on the frequency of exertions and the duty cycle of han d activity — with anchor descriptions at key points on the scale ranging from slow, infrequent hand motions to rapid, continuous hand activity with little or no recovery. HAL forms one of the two axes of the ACGIH TLV for Hand Activity assessment — and is also used independently as a rapid indicator of upper limb repetitive strain risk in task screening.
HARBO
Hand and Arm Risk for Business Operators
HARBO is a practical ergonomic screening tool — designed to assess the risk of upper limb musculoskeletal disorders associated with hand and arm intensive work in small and medium -sized enterprises. The tool evaluates four key risk factors — repetition, force, awkward posture of the hand and arm, and static load — across the specific tasks performed by the worker, producing a colour -coded risk classification that guides prioritisation of ergonomic interventions. HARBO is particularly valued for its simplicity and accessibility — it can be applied by n on-specialist health and safety personnel without extensive ergonomics training — making it a practical first-pass screening tool for organisations that do not have dedicated ergonomics resources.
HAV — Hand-Arm Vibration Assessment
Hand-Arm Vibration Assessment
Hand-Arm Vibration assessment is the measurement and evaluation of vibration transmitted from vibrating tools and equipment through the hands and arms to the worker — assessing the risk of developing hand -arm vibration syndrome, a serious and irreversible condition that causes damage to blood vessels, nerve s, and joints of the hand, wrist, and arm. The assessment involves measuring vibration magnitude — expressed in metres per second squared — using calibrated accelerometers attached to the tool or handle, and calculating the daily vibration exposure — A(8) — by combining vibration magnitude with daily exposure duration. Results are compared against the Exposure Action Value and Exposure Limit Value defined in ISO 5349 and applicable national regulations.
Heat Stress Index
Heat Stress Index — Occupational Heat Exposure Assessment
The Heat Stress Index is a composite measure used to evaluate the thermal stress experienced by workers in hot environments — combining air temperature, radiant heat, humidity, and air movement to produce an index value that reflects the actual heat burden on the human body rather than air temperature alone. Multiple heat stress indices exist — including the Wet Bulb Globe Temperature, the Belding -Hatch Heat Stress Inde x, and the Predicted Heat Strain model — each with specific applications and validity ranges. In occupational settings, heat stress indices are used to determine safe work -rest ratios, identify when conditions exceed safe working thresholds, and assess the risk of heat exhaustion and heat stroke in workers performing physically demanding tasks in hot environments.
Human Factors Analysis
Human Factors Analysis and Classification System — HFACS Human Factors Analysis — and its structured application through frameworks such as the Human Factors Analysis and Classification System — examines the human, organisational, and environmental factors that contribute to errors, accidents, and performance failures in complex
work systems. Originating in aviation safety research and adapted for use across healthcare, manufacturing, rail, and other high -consequence industries, human factors analysis goes beyond individual behaviour to examine how task design, workload, training, communication, organisational culture, and physical environment interact to produce safe or unsafe outcomes. In ergonomics, human factors analysis informs workstation and task desi gn, error -proofing, interface design, and the development of safer work systems.
IAQ Monitoring
Indoor Air Quality Monitoring
Indoor Air Quality monitoring is the systematic measurement of air quality parameters within enclosed workspaces — assessing concentrations of carbon dioxide, carbon monoxide, particulate matter, volatile organic compounds, temperature, relative humidity, and other pollutants that affect the health, comfort, and cognitive performance of building occupants. Poor indoor air quality is associated with sick building syndrome, headaches, fatigue, respiratory irritation, reduced concentration, and increased absen teeism — collectively referred to as building -related illness. IAQ monitoring is conducted using calibrated multi -parameter instruments and dataloggers — with results compared against guidelines from the World Health Organisation, ASHRAE Standard 62.1, and applicable Indian Standards for workplace air quality.
IS 7328
Indian Standard 7328 — Office Furniture — Chairs and Tables
IS 7328 is the Bureau of Indian Standards specification for office furniture — defining the dimensional requirements, adjustability ranges, structural integrity standards, and ergonomic performance criteria for office chairs and tables used in Indian workp laces. The standard specifies seat height ranges, seat depth and width, backrest height and adjustability, armrest dimensions, and desk height and surface requirements — all calibrated to the anthropometric characteristics of the Indian workforce. IS 7328 is the primary Indian regulatory reference for office furniture ergonomics — and compliance with its requirements is relevant to furniture procurement, workstation assessment, and regulatory compliance in Indian office environments.
ISO 2631
International Organisation for Standardisation — ISO 2631: Mechanical Vibration and Shock — Evaluation of Human Exposure to Whole-Body Vibration
ISO 2631 is the internationally recognised standard for the measurement and evaluation of whole - body vibration — the vibration transmitted to the entire body through a supporting surface such as a vehicle seat, floo r, or platform. The standard defines measurement methods, frequency weighting functions, and exposure assessment procedures — producing daily vibration exposure values expressed in metres per second squared that can be compared against health guidance zone s for the risk of adverse health effects including lower back pain, spinal degeneration, and other musculoskeletal disorders. It is applicable to drivers of vehicles and mobile machinery, workers standing on vibrating floors, and anyone whose body is suppo rted by a vibrating surface during work.
ISO 5349
International Organisation for Standardisation — ISO 5349: Mechanical Vibration — Measurement and Evaluation of Human Exposure to Hand-Transmitted Vibration
ISO 5349 is the internationally recognised standard for the measurement and evaluation of hand - arm vibration — the vibration transmitted from vibrating tools and surfaces through the hands and arms to the body. The stan dard defines the measurement procedures, instrumentation requirements, frequency weighting functions, and exposure assessment methodology for calculating the daily hand -arm vibration exposure — A(8) — and assessing the risk of hand -arm vibration syndrome. It is referenced in national regulations across Europe and increasingly in India for workplaces where power tools, hand -held machinery, and vibrating equipment are used — and forms the technical basis for the Exposure Action Value and Exposure Limit Value framework.
ISO 9241
International Organisation for Standardisation — ISO 9241: Ergonomics of Human-System Interaction
ISO 9241 is a multi -part international standard coveri ng the ergonomics of human -system interaction — addressing the design of hardware, software, and workplace environments to support effective, efficient, and satisfying use by people. The standard encompasses display and input device requirements, software usability principles, dialogue design, accessibility, and the ergonomics of physical workstations used with information and communication technology. ISO 9241 is widely referenced in the design of digital interfaces, office workstations, and ICT -based work systems — and its usability principles — effectiveness, efficiency, and satisfaction — have become foundational concepts in human factors and user experience design globally.
JACK
JACK Human Simulation Software
JACK is a digital human modelling software — used to create and animate three-dimensional virtual human figur es that simulate how workers of different body sizes interact with workstations, vehicles, machinery, and environments in a virtual environment before physical construction or production begins. JACK incorporates anthropometric databases for multiple popul ations, biomechanical analysis tools including spinal load calculation and strength prediction, and ergonomic assessment modules — allowing ergonomists and design engineers to evaluate reach envelopes, posture, visual fields, and physical demand of propose d designs and identify ergonomic problems at the design stage. JACK is widely used in automotive, aerospace, and manufacturing industries for virtual ergonomics validation.
Job Strain Model — Karasek Demand-Control Model
Karasek Job Demand-Control Model
The Karasek Job Demand-Control Model is a psychosocial work stress framework — proposing that job stress arises from the combination of high psychological job demands and low decision -mak ing latitude or control. The model identifies four job types based on combinations of demands and control — high strain jobs with high demands and low control, active jobs with high demands and high control, passive jobs with low demands and low control, and low strain jobs with low demands and high control. High strain jobs are associated with the greatest risk of psychological stress, cardiovascular disease, and musculoskeletal disorders — making the model a foundational tool for understanding how work or ganisation affects worker health.
KIM — Key Indicator Method
Key Indicator Method for Manual Handling Operations
The Key Indicator Method is a set of ergonomic assessment tools used for evaluating the risk of musculoskeletal disorders associated with manual handling operations. KIM comprises separa te modules for lifting, holding and carrying — KIM-LHC — pushing and pulling — KIM-PP — and manual handling with whole body forces — KIM-MHO — each using a simple scoring system based on key risk indicators including load weight, body posture, working cond itions, and exposure duration. KIM is widely used in Germany and internationally as a practical, rapid assessment tool that can be applied by trained non-specialists without requiring detailed biomechanical knowledge.
LUBA
Loading on the Upper Body Assessment
LUBA is a posture assessment method — designed to evaluate the postural loading on the upper body during work tasks by measuring joint angles at the neck, trunk, up per arm, lower arm, and wrist and converting them into a composite postural load score. The method uses a coding system based on joint angle ranges — with each range associated with a loading level — and combines the loading scores across all measured join ts to produce an overall postural load index for the task. LUBA is used in situations where upper body postural loading is the primary ergonomic concern — particularly in sedentary assembly work, precision tasks, and work requiring sustained upper body postures.
Lux Measurement — Illumination Assessment
Lux Measurement for Workplace Illumination
Lux measurement is the quantitative assessment of illuminance — the amount of light falling on a work surface — using a calibrated lux meter to determine whether lighting levels in a workplace meet the requirements for the tasks being performed. Illuminanc e is measured in lux — one lux being equal to one lumen per square metre — and recommended levels vary significantly by task type, from 100 lux for general circulation areas to 500 lux for detailed office work and 1000 lux or more for precision visual task s. Inadequate lighting causes eyestrain, headaches, postural strain from leaning towards the work, and increased error rates — while excessive or poorly distributed lighting causes glare and visual fatigue. Indian Standard IS 3483 provides the benchmark fo r workplace illumination levels in India.
MAC — Manual Handling Assessment Chart
Manual Handling Assessment Chart
The Manual Handling Assessment Chart is a UK Health and Safety Executive tool designed to help employers and safety professionals quickly assess the risk of musculoskeletal injury associated with lifting and carrying operations. The MAC tool assesses three types of manual handling tasks — lifting, team lifting , and carrying — using colour -coded risk levels across a range of risk factors including load weight, hand distance from the body, vertical lift zone, posture, floor conditions, carrying distance, and work rate. Green indicates low risk, amber moderate ris k, and red high risk — providing an immediately accessible risk classification that guides prioritisation of ergonomic intervention.
MAPO
Movement and Assistance of Hospital Patients — Movimentazione e Assistenza Pazienti Ospedalizzati
MAPO is an ergonomic risk assessment method — specifically designed to assess the risk of musculoskeletal disorders associated with the manual handling of patients in hospital and healthcare settings. The method evaluates five factors that determine the ov erall patient handling risk — the frequency of manual patient handling operations, the adequacy of patient lifting and transfer equipment, the suitability of wheelchairs and other assistive devices, the ergonomic adequacy of the physical environment, and t he training given to healthcare workers in safe patient handling techniques. These factors are combined into a MAPO index that classifies risk and guides intervention priorities for healthcare facilities.
Moore-Garg Strain Index
Moore-Garg Revised Strain Index
The Moore-Garg Strain Index — also known as the Revised Strain Index — is an ergonomic risk assessment tool used to qu antify the risk of developing distal upper extremity musculoskeletal disorders from repetitive hand and wrist intensive tasks. The tool evaluates six task variables — intensity of exertion, duration of exertion per cycle, exertions per minute, hand and wri st posture, speed of work, and duration of task per day — each scored and combined into a composite Strain Index score. A Strain Index score above five is generally considered hazardous for most workers — and scores increase with the severity of each risk factor.
NASA-TLX
NASA Task Load Index
The NASA Task Load Index is a multi-dimensional rating scale used to assess the perceived workload of a task across six dimensions: mental demand, physical demand, temporal demand, performance, effort, and frustration. NASA-TLX has become one of the most widely used and validated subjective workload assessment tools in human factors and ergonomics research and practice. In occupatio nal ergonomics, it is used to evaluate the cognitive and physical load of complex tasks — identifying tasks or work systems that impose excessive demand on workers and may contribute to fatigue, error, and performance decline.
NERPA
Nordic Ergonomics and Posture Assessment
NERPA is a posture assessment framework that builds on the extensive body of musculoskeletal disorder research conducted in Scandinavia to provide a comprehensive, evidence -based approach to evaluating postural risk in both office and industrial work environments. The framework integrates multiple validated assessment elements — body map surveys, p ostural observation protocols, and task analysis methods — into a structured assessment process that captures postural risk across the full working day rather than at a single point in time. NERPA is particularly valued for its holistic approach — recognis ing that postural risk accumulates across the full range of tasks performed during a shift, not just the most physically demanding ones.
NIOSH Lifting Equation
Natio nal Institute for Occupational Safety and Health Lifting Equation
The NIOSH Lifting Equation is a biomechanically derived formula — revised in 1994 — for calculating the Recommended Weight Limit for specific lifting tasks and the Lifting Index that quantif ies the risk of musculoskeletal injury associated with those tasks. The equation accounts for six task variables — load weight, horizontal distance of the load from the body, vertical height of the lift, vertical travel distance, asymmetry of the lift, and frequency and duration of lifting — combining them into a Recommended Weight Limit below which most healthy workers can lift without significant risk of lower back injury. A Lifting Index greater than one indicates elevated risk — with higher values corre sponding to progressively greater risk of musculoskeletal injury.
Noise Dosimetry
Occupational Noise Exposure — Personal Noise Dosimetry
Noise dosimetry is the personal measurement of occupational noise exposure — using a calibrated noise dosimeter worn by the worker throughout their shift to continuously measure and integrate the noise levels experienced across all tasks and environments e ncountered during the working day. The result is expressed as a daily noise exposure level — LEX,8h — in decibels A -weighted, which represents the equivalent continuous noise level over an eight-hour working day. This value is compared against occupational exposure limits — in India governed by the Factories Act and IS 3483 — with Exposure Action Values and Exposure Limit Values triggering specific employer obligations including hearing protection provision, noise control, and audiometric health surveillanc e.
Nordic Body Map Survey
Nordic Musculoskeletal Questionnaire — Body Map Survey
The Nordic Body Map Survey — formally the Nordic Musculoskeletal Questionnaire — is a validated self-report instrument used to identify the prevalence of musculoskeletal symptoms across nine body regions: neck, shoulders, upper back, elbows, wrists and hands, lower back, hips and thighs, knees, and ankles and feet. Workers indicate whether they have experienced discomfort, pain, or numbness in each region over the past twelve months and the past seven days — and whether any symptoms have prevented them from carrying out normal activities. The Nordic Body Map is used in ergonomics to establish the pattern of musc uloskeletal complaints in a workforce — identifying the body regions most affected and the potential ergonomic risk factors responsible.
OCRA — Occupational Repetitive Action Index
Occupational Repetitive Action Index
The OCRA Index is an internationally recognised ergonomic assessment method — used to quantify the risk of upper limb work -related musculoskeletal disorders arising from repetitive tasks involving the upper limbs. The OCRA method calculates the ratio betwe en the actual number of technical actions performed per shift and the recommended number — accounting for recovery time, frequency of actions, force, awkward postures, and additional risk factors such as vibration and contact stress. An OCRA index below 2. 2 indicates acceptable risk — between 2.2 and 3.5 borderline — and above 3.5 indicates present risk requiring intervention. The OCRA Checklist provides a simplified version of the full OCRA Index for use in workplace screening.
OSHA Ergonomics Guidelines
United States Occupational Safety and Health Administration — Ergonomics Guidelines
The OSHA Ergonomics Guidelines are a set of industry -specific and general ergonomics guidance documents — providing practical frameworks for identifying, assessing, and controlling ergonomic risk factors in the workplace. Although not legally binding in India, OSHA ergonomics guidelines are widely referenced by multinational employers, institutional investors, and ESG frameworks operating in India — as they represent internationally recognised best practice for ergonomics programme development, risk assessment, and control implementation. Indu stry-specific OSHA ergonomics guidelines cover sectors including nursing homes, retail grocery, poultry processing, shipyards, and sewing — each addressing the specific ergonomic risks of that sector.
OWAS
Ovako Working Posture Analysis System
OWAS is one of the earliest and most widely used systematic posture assessment methods — designed to evaluate the prevalence and severit y of awkward working postures in industrial environments through structured observation. The method categorises postures of the back, arms, and legs into defined classes and combines them with load or force information to produce an action category from on e to four — indicating whether the working posture is acceptable, requires attention in the near future, requires attention as soon as possible, or requires immediate corrective action. OWAS is particularly suited to tasks involving a wide variety of postu res and is valued for its simplicity and ease of use by non-specialist observers.
PATH
Posture, Activity, Tools and Handling
PATH is a work sampling -based ergonomic observation method — used to characterise the ergonomic exposures experienced by a worker over the full working day through systematic, time - sampled observation of posture, activity, tools used, and handling operatio ns. Unlike tools that assess a single task at a specific point in time, PATH captures the distribution of ergonomic exposures across the entire working day — recording the proportion of time spent in each posture category, performing each type of activity, and using each type of tool or handling operation. This whole -day exposure profile makes PATH particularly useful for jobs with high task variability where single -task assessment methods may not capture the full ergonomic picture.
PLIBEL
Method for Identification of Musculoskeletal Stress Factors
PLIBEL is a Swedish ergonomic screening checklist — designed to identify mus culoskeletal stress factors in the workplace through structured observation of the work environment and task performance. The checklist evaluates ergonomic risk factors across five body regions — knee, hip and back; elbow, forearm and hand; neck and should er; feet; and a general section — using yes/no questions about posture, force, repetition, duration, and environmental conditions to identify risk factors requiring further assessment or corrective action. PLIBEL is valued for its comprehensiveness — cover ing a wider range of body regions and risk factors than many rapid screening tools — and its accessibility to non-specialist users.
QEC — Quick Exposure Check
Quick Exposure Check
The Quick Exposure Check is a practitioner -friendly ergonomic assessment tool — designed to assess the level of exposure to work -related musculoskeletal disorder risk factors in a rapid, systematic, and reprod ucible manner. QEC is distinctive in that it combines observer assessment with worker self-report — the assessor evaluates back, shoulder and arm, wrist and hand, and neck postures and movements, while the worker provides information about perceived exerti on, vibration exposure, work pace, and stress level. These two perspectives are combined to produce exposure scores for each body region, which are compared against action levels to guide intervention priorities.
RAPP
Risk Assessment of Pushing and Pulling
RAPP is a UK Health and Safety Executive tool used to assess the risk of musculoskeletal injury associated with pushing and pulling tasks — a category of manual handling that is often overlooked in favour of lifting assessment despite being a significant cause of back and shoulder injury in the workplace. The RAPP tool covers two scenarios — pushing or pulling load s over a distance, and pushing or pulling loads in a fixed position — and evaluates risk factors including the force required, the frequency and duration of the task, posture, the load handling equipment used, the floor surface, and the working environment . Like the MAC tool, RAPP uses a colour -coded risk classification system — green, amber, and red — to communicate risk level and guide intervention.
REBA
Rapid Entire Body Assessment
REBA is a whole -body postural assessment tool — designed to assess the musculoskeletal risk associated with dynamic, unpredictable, and rapidly changing working postures that cannot be adequately captured by tools designed for static or repetitive tasks. R EBA evaluates postures of the trunk, neck, legs, upper arms, lower arms, and wrists — alongside load or force, coupling quality, and activity type — to produce a REBA score from one to fifteen that directly maps to an action level from negligible to very h igh risk. REBA is particularly suited to healthcare, construction, and service industry tasks where the full body is engaged in variable, unpredictable postures.
ROSA
Rapid Office Strain Assessment
ROSA is an ergonomic assessment tool — specifically designed to evaluate the risk of musculoskeletal discomfort associated wit h office workstation use. The tool assesses five workstation components — the chair, monitor and telephone, keyboard and mouse, and the combinations thereof — producing a final ROSA score that ranges from one to ten and maps to a risk level from negligible to very high. ROSA is particularly valued for its ability to quantify office ergonomic risk using a standardised, reproducible scoring system — enabling comparison across workstations and tracking of improvement following ergonomic interventions.
RULA
Rapid Upper Limb Assessment
RULA is one of the most widely used ergonomic assessment tools globally — designed to evaluate the exposure of the upper limbs to ergo nomic risk factors in sedentary and light industrial work. The tool systematically assesses the postures of the upper arm, lower arm, wrist, neck, trunk, and legs — alongside muscle use and force or load — assigning scores to each element and combining the m into a grand score from one to seven that maps directly to an action level ranging from acceptable posture to immediate investigation and change required. RULA is fast to apply, requires no specialist equipment, and produces a quantified risk score that enables comparison across workstations, tasks, and time.
RULA-E
Rapid Upper Limb Assessment — Extended
RULA -E is an extension of the original RULA method — designed to address limitations of the standard RULA tool when applied to tasks that involve additional risk factors not captured in the original scoring system — including contact stress, static work, precision work, and tasks performed in constrained or unusual postures. RULA -E incorporates additional scoring elements for these factors — producing a more comprehensive risk assessment for complex tasks where the stand ard RULA tool may underestimate the actual ergonomic risk. It is particularly useful in electronics assembly, precision manufacturing, and tasks requiring fine motor control where contact stress and static loading of the upper limbs are significant risk fa ctors alongside posture.
Remote Working Ergonomics Checklist
Remote Work Ergonomics Assessment Tool
A Remote Working Ergonomics Checklist is a structured self -assessment tool used to evaluate the ergonomic adequacy of a home office or remote workstati on — covering the chair, desk, monitor, keyboard, mouse, lighting, and working environment — and identifying adjustments, equipment additions, or behavioural changes needed to reduce ergonomic risk for employees working outside the conventional office envi ronment. As remote and hybrid working has become standard across IT, financial services, and corporate functions in India, the ergonomic risks of home office environments — including unsuitable furniture, poor lighting, inadequate workstation setup, and la ck of movement — have emerged as a significant and growing occupational health concern. Remote working checklists are typically completed by the employee — with guidance and follow -up support from an ergonomist or trained ergonomics champion.
Spine Load Analysis
Lumbar Spine Compressive Force Analysis — Biomechanical Models
Spine Load Analysis uses biomechanical modelling to calculate the compressive and shear forces acting on the lumbar spine — particularly the L4/L5 and L5/S1 intervertebral discs — during manual handling, lifting, and awkward posture tasks. The analysis uses static or dynamic biomechanical models — such as the 3DSSPP model or the Dortmund Approach — to calculate the forces generated by the external load, the body segment weights, and the muscle forces required to maintain equilibrium, and expresses the result in Newtons for comparison against established biomechanical tolerance limits for the lumbar spine. Spine load analysis is used to evaluate the risk of acute low back injury and the long-term risk of lumbar disc degeneration associated with repetitive or high-load spinal loading.
Strain Index — SI
Moore-Garg Strain Index
The Strain Index is an ergonomic risk assessment method used to evaluate the risk of distal upper extremity musculoskeletal disorders from work requiring repetitive and forceful exertions of the hand and wrist. The tool assesses six task variables — intensity of exertion, duration of exertion per cycle, exertions per minute, hand and wrist posture, speed of work, and duration of task per day — each assigned a multiplier based on defined criteria, and combines the multipliers into a composite Strain Index score. A score below three is generally considered safe, three to five questionable, and above seven ha zardous — providing a clear risk classification that guides intervention. The Revised Strain Index — RSI — is an updated version with improved validity.
ULRA
Upper Limb Risk Assessment
The Upper Limb Risk Assessment is a structured ergonomic evaluation framework used to systematically identify and quantify the risk factors associated with work -related upper limb disorders — covering repetition, force, awkward posture, static loading, vib ration, contact stress, and environmental factors such as cold and glare. ULRA frameworks are used as comprehensive screening tools that draw on multiple validated assessment methods — applying the most appropriate tool for each identified risk factor rath er than relying on a single assessment instrument. This multi -method approach provides a more complete picture of upper limb ergonomic risk than any single tool can deliver — and is particularly suited to complex tasks where several risk factors interact.
WBGT
Wet Bulb Globe Temperature Index
The Wet Bulb Globe Temperature is the internationally recognised composite heat stress index used in occupational health to assess the thermal environment experienced by workers — combining natural wet bulb temperature, black globe temperature, and dry bulb temperature into a single index value that reflects the actual heat burden on the human body from all environmental heat sources simultaneously. Referenced in ISO 7243, WBGT is the standard method for assessing occupational heat stress in India and internationally — with WBGT action levels defined for different work intensities and acclimatisation stat es. WBGT measurements are taken using a WBGT meter comprising three thermometers — the index is calculated using a weighted formula that gives greatest weight to the wet bulb component, reflecting the dominant role of humidity and evaporative cooling in de termining heat stress.
WISHA Lifting Calculator
Washington State Industrial Safety and Health Act — Lifting Calculator
The WISHA Lifting Calculator is an ergonomic tool — base d on the NIOSH Lifting Equation — that provides a simplified, user -friendly interface for calculating the recommended weight limit and lifting index for manual lifting tasks. The calculator guides users through the key task variables — load weight, horizon tal distance, vertical height, asymmetry, and lift frequency — and produces a recommended weight limit and lifting index in a format that is accessible to non-specialist users including supervisors and safety officers. WISHA ergonomics guidelines also cove r pushing, pulling, and carrying tasks — making the Washington State ergonomics framework one of the most practically comprehensive regulatory ergonomics toolsets available.
Work-Rest Ratio Analysis
Work-Rest Ratio and Recovery Time Analysis
Work-Rest Ratio Analysis is the ergonomic assessment of the relationship between periods of physical or cognitive work and the recovery periods available to the worker — evaluating whether the recovery time built into a work schedule is sufficient to prevent the accumulation of fatigue and the development of musculoskeletal disorders. Inadequate recovery between physically demanding tasks or repetitive cycles is a primary mechanism through which cumulative musculoskeletal damage develops — because muscles, tendons, and joints require sufficient rest to repair micro-damage and restore metabolic balance between periods of loading. Work-Rest Ratio Analysis uses established guidelines — including those from NIOSH, ACGIH, and occupational physiology research — to determine appropriate work-rest ratios for specific task intensities, environmental conditions, and worker populations.