The selection of courseware is a difficult problem in the use of computers in education. A dissemination procedure for a courseware selection instrument involving workshops for computer coordinators is described. Computer coordinators of 267 Dutch secondary schools were asked how they used certain sources of information in selecting courseware. Many used results of evaluations by the Soft- and Courseware Evaluation Centre for the Netherlands, but expressed the need for additional information. Six secondary schools participated in a workshop for computer coordinators who were taught to use an instrument called "The Courseware Selector" to evaluate courseware. The coordinators were expected to disseminate the information in their schools through further workshops. A multiple case study design was used to compare developments in the six schools involved in this cascade approach. In general, effects on the overall selection of courseware were not large, but promising effects did appear related to teachers becoming better acquainted with courseware and reducing their computer phobia. A critical variable in implementation was the level of experience in computers at the school initially. (Contains 7 references.) (SLD)