To describe conditions, assess the present situation, and develop a profile of Licensed Practical Nurses (LPNs), data were collected from a random sample of actual employment locations and LPNs by means of personal interviews with 348 administrators in employment locations, 688 LPNs, 130 Registered Nurses, and 123 aides in the states of Illinois and Iowa. Data from interviews were analyzed to obtain relationships between age, type and level of current nursing position, and type of employers. Card sorts were used for obtaining data on actual job requirements of LPNs. LPNs across all ages were a highly stable occupational group reflected by relatively continuous employment, only slightly influenced by marital status, number of children, and family responsibilities. They were almost a fully utilized group in providing nursing service in all types of employment situations, but the majority were employed in general hospitals on a full-time basis. The majority of LPNs felt that their training had been adequate but recommended that more is needed in the area of medications. A wide range of nursing functions and roles with high levels of responsibility were performed. Part II of the study is available as VT 011 351. (SB)