The psychiatric nursing department at a university teaching hospital identified the need to develop a management tool to systematically and objectively determine resource requirements (staffing) for unique psychiatric patient populations. A classification methodology was needed for budget development, trending, productivity monitoring, and potentially developing a rich data base for nursing research. A study of existing classification systems found them to be limited for use in psychiatric settings. The psychiatric nursing department designed and implemented a patient classification tool based on biopsychosocial needs manifested by psychiatric patients in acute care settings. oday we are in a cost-containment era of health care. As part of this, nursing administrators must T determine the number of competent nursing personnel necessary to meet patient care requirements.Workload is the key. What is the total workload on any given unit, for any given shift? In order to determine the workload, an accurate description of the patient population is necessary. To describe the patient population, a valid classification tool that measures the degree of nurse-Julianne Morath, RN, MS, is dependency or level of patient self-sufficiency is essential. Accountability for effective and efficient use of resources requires determining not only how many staff to employ but also monitoring how to use that staff on a day-to-day, shift-to-shift basis to meet patient care requirements.Nurse-staffing requirements are variable due to many uncontrollable determinants. For example, the requirements change because patients are admitted, discharged, and pass through various stages of illness during a hospitalization; therefore, patient-dependency or need for nursing care changes. The ultimate goal of any staffing system is to determine how many staff are required to deliver appropriate care services, usually translated into full-time equivalent (FTE) positions. Two questions arise when formulating staffing recommendations: What is the total workload? What portion of the workload can be handled by each member of the staff?Staffing methodologies differ based on how these 40 VOL. XXV, NO. 3,4. 1989