A method is presented for measuring the activities of case management in the care of the severely mentally disabled in catchmented public community mental health systems. Two variants of the method were compared, interviewing case managers and record abstracting. The methods were tested in two community mental health center (CMHC) sites, and appear to yield comparable results. The record abstract method seems workable for retrospective examination of case management in a CMHC system, and for the comparison of case management in different systems.