The paper is composed of two parts. The first, on the basis of records concerning the activities of the Workers’ Self-Government Board at the Plant, brings an essay in establishing: (1) on what principles the respective branches of the Board are made to participate in the sessions (plenary session of Workers’ Board, Praesidium of Workers’ Board, Special-Problems Committees), and (2) to what extent the tasks assigned to these branches are carried into effect. Upon analysing this second point it has become possible to reach conclusions of fairly high importance. We have found out, in fact, that in practice the Workers’ Self-Government agencies achieved the tasks entrusted to them, but that their activities were not of the same standard 'in the different fields. Their decision-taking and supervising functions were certainly the most prominent, while their initiatory function was carried out to the least extent. In the objective sense, the activities of self-government agencies ".ended to concentrate on questions relating to problems of economics and production. Within the examined time period, a decline of the activity of most of the self-government agencies was noted in the years 1974—75 as compared with the 1971—1973 period. The second part of the paper deals with the problem of the way in which the institution of the Workers’ Self-Government Board influences the political culture of the Plant’s staff. The interviews made with members of the staff (in their prevailing' part, factory workers, half of them members of the Polish United Workers’ Party, and the other half non-party men, employed at the Plant for ten years or more) were undertaken in order to establish: (1) how much was known on the main trends of activity conducted by the Workers’ Board at the Plant, (2) how did the workers visualise some of the functions performed by the Board (for instance, on what principles the sessions were prepared, the resolutions were proposed, etc.), (3) under what light did they see the role of the Board as an institution making it possible for the workers to participate in the Plant’s management, and (4) what postulates for possible changes in the functioning of this institution were advanced by the workers. Our inquiry has shown that the workers know comparatively little about the basic issues involved in the functioning of the Workers’ Self-Government Board. It has found, too, that in the overwhelming majority of the respondents the institution of self-government and its functioning do not lead to the conviction that they really co-participate in the Plant’s management.