Poland’s experience from 20 years ago shows that the labour system not only is determined by the prevailing economic, social and political system, but also conversely, any changes within it affect the global system. It is therefore recommendable to take more interest in labour system in the area of labour law study and social policy. The notion of labour law system, although already known in the beginnings o f the 20th c. and currently applied in the social study by the Catholic Church, tends to be understood in a variety of ways. Therefore, the author proposes two definitions of the term, one narrower denoting the work relations within a company and one broader denoting also collective work relations and their axiological assumptio...