The Minnesota Child Development Inventory (MCDI) measures the development of preschool-age children, using an inventory format to obtain mothers' observations. To demonstrate the validity of MCDI results, the authors compared them to the results of psychological evaluations, including data on intellectual functioning, fine motor skills, and expressive language development. The study sample consisted of 109 children referred to a university clinic for psychological evaluation. Four MCDI scales (General Development, Fine Motor, Expressive Language, and Comprehension-Conceptual) and the MCDI profile as a whole corresponded well with the conclusions of psychological evaluation. (Author/RC)