The method serves for operating at least one pump assembly (1, 1a, 5) of a multitude of pump assemblies (1, 1a, 5) which each comprise a programmable electronic motor (4, 4a, 6) control for individualpumps or groups or pumps, and which are at least temporarily data-connected to a server (8) via a network, with which data, in particular parameters and/or operating data of the multitude of pump assemblies (1, 1a, 5) is transferred via the network to a server (8) and is stored there in a data base. The stored data is processed according to defined typically statistical computation rules, whereupon the at least one pump assembly is then adapted in its programming via the network, on the basis of the processed data.