• Find the most important variables first.
• Be aware that some costs are hidden or indirect; consider all possible effects of injuries and
diseases.
• Some variables may represent the same effect in a different way; make sure that double
counting of costs and benefits is avoided.
• The national system of social security or legislation may cover only part of the work-related
accidents and illnesses. In some countries, occupational diseases are very strictly defined as a
result of which certain work-related illnesses (in particular stress-related) are not recognized as occupational. Also, differences exist in the definition of work accidents (e.g. in some Member States commuting accidents are work accidents).
• Agree with most important stakeholders which variables are to be included in the economic
evaluation.