Measuring degree of, and opinions on workers-participation in small firms. Knowledge of legal obligation of instating a 'personeelsvergadering' ( employees council ) / application of laws about participation of employees in management, how / how much participation of employees when law is not applied / opinion of employees about their means of participation / perception of employees and management of ( dis )advantages of the 'personeelsvergadering' / which business / personal characteristics relate to participation and its perception. Background variables: basic characteristics/ occupation/employment/ education/ organizational membership