This is a history of the International Union of Pure and Applied Chemistry Solubility Data Commission and the Solubility Data Project that it organized and supervised. It follows the progress of the project from a working party in 1973 to a Subcommittee of the Equilibrium Data Commission, 1976-1979, to The Solubility Data Commission, 1979-2001, when the Subcommittee on Solubility and Equilibrium Data (SSED) succeeded it.