Terminology note
“Job demands analysis” is the term most commonly used by occupational therapists, exercise physiologists, and rehabilitation coordinators. The same instrument is called an inherent requirements of the job (IROJ) document in legal and HR contexts, inherent requirements of the role in OHS clinical settings, task demands analysis when applied at the task level rather than the full role, and functional job demands in workers compensation contexts. All refer to the same concept. See the full IROJ guide for the legal framework.
What is a job demands analysis?
A job demands analysis is a structured clinical document that specifies — in quantified, measurable terms — the physical, cognitive, environmental, organisational, and interpersonal demands that a worker must be capable of meeting in order to perform a specific role safely and effectively.
The key word is quantified. A JDA does not say “the worker must be able to lift heavy objects.” It says the worker must be able to lift 25 kg from floor to waist height occasionally (up to one-third of the shift), and 10 kg frequently (one-third to two-thirds of the shift). That specificity is what makes the document clinically useful — and legally defensible.
The JDA is the anchor document for three critical occupational health functions: pre-employment screening (can this candidate perform the role?), return-to-work case management (what capacity does the worker need to recover before returning?), and workplace rehabilitation (what conditioning targets must the program achieve?).
How a JDA differs from a generic job description
| Generic job description | Job demands analysis |
|---|---|
| Written by HR or the hiring manager | Developed by a qualified OHS clinician (OT, EP, OH physician, OH nurse) |
| "Responsible for manual handling tasks" | "Lifting 20 kg occasional, 10 kg frequent, from floor to bench height" |
| Describes accountabilities and KPIs | Quantifies physical, cognitive, environmental, organisational, and interpersonal demands |
| No clinical defensibility | Primary clinical reference for all fitness-for-work decisions |
| Updated when the role changes | Immutable once signed; any material change requires a new version |
| Used for recruitment and performance management | Used for PES, RTW, work hardening, health surveillance, workers compensation |
The five demand categories in a JDA
A complete job demands analysis covers five demand categories. Missing any one creates gaps that cannot be used to support downstream clinical decisions. The five categories mirror the structure of the IROJ document — they are the same instrument.
Physical demands
The biomechanical load profile of the role — lifting, carrying, pushing, pulling, postural requirements, repetitive motion, and vibration exposure.
- Lifting capacity (kg, occasional / frequent / constant)
- Prolonged postures (standing, kneeling, overhead)
- Push/pull forces (Newtons or kg equivalent)
- Hand-arm vibration (HAV) / whole-body vibration (WBV)
- Fine motor dexterity requirements
Clinical use: Defines PES functional test thresholds and RTW capacity grading. Must specify frequency and duration — a load figure alone is insufficient for clinical decision-making.
Cognitive demands
The mental workload profile of the role — decision-making complexity, sustained concentration requirements, safety-critical functions, and information processing speed.
- Decision-making load and time pressure
- Sustained concentration duration
- Safety-critical function (operator, driver, clinician)
- Multi-tasking and interruption tolerance
- Literacy / numeracy thresholds
Clinical use: Required for fitness-for-duty determinations in safety-critical roles. Under ISO 45003, cognitive demand documentation is a prerequisite for psychosocial hazard identification.
Environmental demands
The hazard exposure profile of the role — noise, dust, chemicals, temperature, working conditions, and shift structure.
- Noise (LAeq dB and peak dB)
- Dust / chemical / biological agents
- Temperature extremes (heat stress, cold stress)
- Working at heights, confined spaces, live traffic zones
- Shift and roster structure (day, night, rotating, on-call)
Clinical use: Drives health surveillance trigger criteria — audiometry, spirometry, biological monitoring. Shift structure is an environmental demand with psychosocial implications (fatigue, lone working).
Organisational demands
The structural and workload characteristics of the role — supervision access, pace of work, remote or isolated working conditions, and organisational support.
- Workload pace and variability
- Access to supervision and peer support
- Remote / lone working conditions
- On-call and emergency response obligations
- Performance metrics and surveillance
Clinical use: Maps to COPSOQ III organisational and social domains. Required for ISO 45003 psychosocial hazard identification at source — generic survey data without role-level context cannot be attributed to specific hazards.
Interpersonal demands
The social and relational demands of the role — client contact type and intensity, conflict exposure, emotional labour, and role-specific relationship obligations.
- Client-facing contact (type, duration, complexity)
- Violence or aggression exposure
- Emotional labour (trauma-adjacent, grief, distress)
- Team interdependency and conflict exposure
- Public-facing roles with reputational accountability
Clinical use: The psychosocial hazard baseline for emotional demands, work-related violence, and role conflict domains in COPSOQ III. Cannot be inferred from job title — must be documented per role.
When a JDA is legally required
No single piece of Australian legislation uses the term “job demands analysis” — but the concept is embedded across multiple frameworks that collectively make the JDA de facto mandatory for any employer with an occupational health program.
Pre-employment health screening
Under the Disability Discrimination Act 1992 and state equivalents, a PES can only ask about health conditions that relate to the genuine requirements of the job. Without a JDA, there is no documented basis for any PES question. An undocumented PES is a blanket health screen — which courts have consistently treated as discriminatory.
Return-to-work case management
Workers compensation frameworks in all Australian jurisdictions require RTW plans to identify suitable duties and a pathway to pre-injury duties. The JDA defines what pre-injury duties require — without it, the "full duties" target is undefined and subjective. Insurers and employers who cannot produce a JDA in RTW disputes are operating blind.
Workplace rehabilitation programs
Accredited workplace rehabilitation providers are required to conduct a job demands assessment as part of the rehabilitation process. The assessment must show that the program's conditioning targets align with the documented demands of the role the worker is returning to.
Health surveillance programs
Under the WHS Regulations, health surveillance is triggered by specific hazard exposures — not by job title. The JDA's environmental demand section documents which exposures apply to the role, and therefore which surveillance programs (audiometry, spirometry, biological monitoring) are required.
Who conducts a job demands analysis?
A JDA is a clinical instrument and must be developed by — or in close collaboration with — a qualified OHS clinician. In Australia, the practitioners most commonly responsible for JDA development are:
Occupational therapist (OT)
The most common JDA practitioner in workplace rehabilitation and RTW contexts. OTs are trained in activity analysis, functional capacity evaluation, and demand quantification. Most workers compensation schemes recognise OT-authored JDAs.
Exercise physiologist (EP)
Increasingly involved in JDA development, particularly for roles with significant physical demand profiles. EPs bring biomechanical measurement expertise to lifting load quantification and functional capacity assessment.
Occupational health physician
Required for JDA sign-off in complex roles with significant medical fitness thresholds — aviation, mining, safety-critical industrial roles. The physician validates that the documented demands are clinically appropriate.
Occupational health nurse (OHN)
In high-volume industrial settings, accredited OHNs develop and maintain JDAs for large role libraries, working under OHP supervision for complex determinations.
Important: A JDA cannot be written at a desk without observing the job. On-site observation, physical measurement (load cells, sound level meters, air monitoring), and supervisor validation are all required components of a defensible document.
How OccuSpan's IROJ module automates JDA documentation
OccuSpan's IROJ module is a structured digital workflow for developing, validating, and publishing job demands analyses. It replaces the blank-page approach with a guided five-domain template, pre-populated demand categories, and an integrated sign-off workflow.
Role library — maintain a searchable library of JDAs across the enterprise, with version control and change-trigger alerts
Demand pre-population — standard demand categories (sedentary through very heavy) are selectable; frequency and duration fields are built in
Environmental hazard flags — noise, dust, chemical, and shift structure fields automatically link to the health surveillance trigger matrix
Sign-off workflow — OHS clinician digital sign-off with timestamp; document locked on signing; archived versions retained indefinitely
Module integration — PES assessments pre-fill from the IROJ demand profile; RTW capacity targets reference the signed IROJ; health surveillance programs derive from the environmental demand section
Frequently asked questions
What does a job demands analysis contain?
A job demands analysis documents five demand categories for a specific role: physical demands (lifting loads, postures, frequency), cognitive demands (decision-making load, concentration, safety-critical functions), environmental demands (noise, dust, temperature, shift structure), organisational demands (supervision, workload pace, isolation), and interpersonal demands (client contact, conflict exposure, emotional labour). Each category is quantified — not merely listed — so it can be used as a clinical benchmark for fitness-for-work decisions.
Is a job demands analysis legally required in Australia?
No single piece of legislation names the job demands analysis by that term, but the underlying obligation is embedded in the WHS Act, state anti-discrimination acts, and workers compensation frameworks. A pre-employment screen without a JDA cannot be demonstrated as job-related — making it vulnerable to discrimination claims. A return-to-work plan without a JDA has no documented capacity target against which to measure progress. In practice, OHS regulators and workers compensation insurers treat the JDA as mandatory.
Who needs a job demands analysis?
Any employer who conducts pre-employment health screening, manages return-to-work cases, or runs a workplace rehabilitation program needs a JDA for each role covered. This is not limited to physically demanding roles — cognitive and psychological demand documentation is equally important for office-based safety-critical roles (e.g. air traffic controllers, financial traders, healthcare clinicians). The JDA is the clinical instrument that makes all downstream occupational health decisions defensible.
How long does it take to complete a job demands analysis?
A thorough JDA for a single role takes two to four hours on-site (observation, measurement, supervisor interview) plus one to two hours for documentation and sign-off. Complex roles with multiple environmental exposures or safety-critical functions take longer. Using a structured template — such as OccuSpan's IROJ module — reduces documentation time by 60–70% by pre-populating demand categories and generating the sign-off workflow automatically.
OccuSpan IROJ Module
Build your JDA library in OccuSpan
Every OccuSpan clinical module reads from the IROJ. Pre-employment screens are pre-filled from the demand profile. RTW capacity targets are set against it. Health surveillance triggers are derived from it. Build once — use everywhere.