The paper summarizes results of time-in-motion studies on 259 mildly to severely mentally retarded clients in programs for the developmentally disabled (mean ages 11-42 years old). The study was part of an effort to determine staff utilization patterns and costs associated with the delivery of each of 40 habilitation/training packages developed from functional skill assessment in eight domains of motoric skills, dressing/grooming, toileting, eating, language, reading/writing, quantitative, and independent living. Care or training activities for each client were recorded for 24 hours per day over 5 days. Data were analyzed according to three staff position categories: direct care personnel, licensed personnel, and support personnel. Data are presented for the percent of care or training performed by specific staff position and direct costs of care and training in each of the eight domains. (CL)