One of the aims of the EU subsidized project EurIPACS, is to provide evidence to assess effects and costs of PACS. To this aim, assessment studies are carried out in three hospitals. These hospitals all implement a partial and/or small-scale PACSystem in the period 1992 - 1994. The effects of these systems on communication, coordination, and efficiency are assessed by before-after measurements, according to one evaluation protocol. Most before- measurements have been completed, on the basis of which draft guidelines for implementation have been made. This paper describes the first result and the draft guidelines.