Dear Minrah,
the study on aspect / impact related to environment and hazard / risk related occupational health for the activities are derived pre defined matrix. what type of matrix you are using? is it common for both types or you have different for different areas.
standarad type recommended by the consultants may be SSPD (scale, severity, periodicity and duration) for environmental matrix and likelyhood of occurance and hazard severity for occupational health.
which one are you using? try to customize the scale for likely hood, severity like factors to address your concern on human behavior. aslo if can co relate this abnormal human behaviour to training, education, skills etc you may address the issue better.
regards
nandish