Two intervention studies were carried out in industry in which a participatory safety program was tested in practice. The goal of both projects was to launch an improvement process leading to a better work environment and safety, as well as to more efficient production. The cooperation partners, a shipyard and a department of a metal product company, represented industries in which the accident rate is above the national average in Finland. In the rapidly changing work environment of a shipyard, e.g. accident hazards arise unexpectedly. Employees’ active role is emphasized in the prevention of accidents, in detecting and correcting safety and other problems.