This article presents the results of the work of the Tripartite Commission for Socio-Economic Affairs (TC) in 2001–2015. To show the effectiveness of the TC’s work, the author’s adaptation of the associational participation scale (Tálos, Kittel 2001) was employed. The result was categorisation of the effects achieved by the TC within social dialogue and a periodisation of the TC’s activity in the research period, which quantitatively confirmed the results reported by other researchers. The article concludes with a discussion about the potential use of results in order to formulate expectations about the future effectiveness of the new tripartite body in Poland (the Social Dialogue Council) and elaborate a framework for comparing the effectiveness of tripartite bodies worldwide.