The monitoring process and the role of monitoring in mental health center decision making are discussed in relation to information systems. Monitoring requires an information system based on the center's annual plan for programs and budgets. This system must contain at least minimal data on client movement, services, staff activity, and costs. The monitoring process includes planning, monitoring, and assessment. Three areas discussed in this paper are the monitoring process, information systems and monitoring and using information systems. Issues addressed include organizational readiness, information system adequacy, integration of system elements, feedback, and the data processing mode (manual versus automated). Specific suggestions and practical examples are included. The final section links information system reports with management in order to assist managers by providing data about program goals, fluctuations in demands for services, and staff productivity. Summary reports aid program and budget planning and program evaluation. (Author/MLT)