This report presents the results of an evaluation of New York State's Mental Health Information Services (MHISs). The goals of the evaluation were to determine the effectiveness with which legislatively mandated information services to the mentally disabled and to the courts were carried out, and to evaluate MHIS workload and activity in order to assess their request for staffing increases. Following an executive summary, the introduction provides background information on the establishment of the four MHISs, and details the services they are required to provide, including those explicitly mandated and those which implicitly flow from the law. Chapter II describes the procedures used to evaluate the program's effectiveness, and provides a discussion of the results accompanied by 11 data tables. Chapter III reviews the program operation of the four MHISs, analyzes prior measures of MHIS workload, and presents the legislative committee's own survey of MHIS workload. Chapter summaries are provided for each area. The appendices include a list of those interviewed and contacted for the evaluation, samples of MHIS files used in the evaluation, classifications of sections of the law mandating or permitting information services, the MHIS workload form, and copies of the correspondence between the agencies involved in the evaluation and the legislative committee (responses and rebuttal). (MCF)