The main purpose of collecting this data was to study the relation between the work-environment at small firms from the Dutch metal industry and employee wellbeing and organizational performance, and the role of the government. Participating firms are member of the Dutch employer's association for small and medium-sized firms in the metal industry and have a production facility (i.e, trading firms are not included). There were three repeated measurements with about a year in between. The owner/manager was interviewed in a semi-structured manner, the owner/manager filled out a paper-and-pencil questionnaire, the production employees filled out a paper-and-pencil questionnaire, and a occupational health and safety (OHS) expert observed and rated the work-environment in the production facility. Moreover, after the first measurement, the sample of participating companies were randomly divided in a control group and in an intervention group. The intervention group was exempted from OHS inspection by the Dutch inspectorate body (Inspectie SZW) for the duration of the project.