Episode 100 - Job Hazard Analysis (JHA) - How to factor in experience and training

Episode 100 digs into a subtle but critical part of Job Hazard Analysis: how a worker’s experience and training level change the actual risk of a task. Dr. Ayers explains why two people doing the same job may face very different hazard profiles—and why JHAs must reflect that reality instead of assuming all workers perform tasks the same way.

  Core Message

A JHA is not just about the task—it’s about who is performing the task. Experience and training dramatically influence hazard recognition, error likelihood, and control effectiveness.

  Key Points from the Episode 1. JHAs Often Ignore Worker Variability

Most JHAs assume:

• Every worker has the same skill level

• Everyone follows the procedure perfectly

• Everyone recognizes hazards equally

• Everyone reacts the same way under pressure

These assumptions are false—and dangerous.

  2. Experience Changes How Hazards Are Managed

Dr. Ayers highlights how experienced workers differ from new workers:

• They anticipate problems earlier

• They recognize subtle hazards

• They understand the “feel” of the job

• They know when something is off

• They compensate for minor issues automatically

But experience can also create overconfidence and normalization of deviation.

  3. Training Level Directly Affects Risk

Workers with limited training:

• Miss early warning signs

• Rely heavily on written procedures

• Struggle with unexpected conditions

• Are more likely to make errors under stress

• Need more supervision and coaching

A JHA that doesn’t account for this underestimates risk.

  4. How to Incorporate Experience and Training into a JHA

Dr. Ayers recommends adjusting the JHA by considering:

• Who is performing the task (new hire, apprentice, seasoned worker)

• How often they perform the task

• How complex the task is

• What level of judgment is required

• How much supervision is needed

This leads to more accurate hazard identification and better controls.

  5. Controls Must Match Worker Capability

Examples include:

• More detailed procedures for inexperienced workers

• Additional coaching or mentoring

• Slower pace expectations

• Extra verification steps

• Higher supervision levels

• More conservative controls for high‑risk tasks

The goal is to match the control strategy to the worker’s capability.

  6. JHAs Should Be Living Documents

As workers gain experience:

• Controls may change

• Steps may be simplified

• Risk ratings may shift

• Training requirements may evolve

A JHA should grow with the workforce.

  Practical Takeaway

A task is never “just a task.” Risk changes depending on who performs it. High‑quality JHAs factor in experience, training, judgment, and supervision—because these human elements determine whether a task is performed safely or dangerously.