The Learning Accomplishment Profile - Third Edition (LAP-3) is a criterion-referenced assessment instrument for the 36-72 month age range, measuring development in the domains of gross motor, fine motor, pre-writing, cognitive, language, self-help, and social/emotional. It is a re-examination of the contents and organization of the LAP-R which incorporates recent research, especially related to language and literacy and assimilates recent changes in the general population of young children. Its on-going observation format allows teachers and/or clinicians to record a child's progress and introduce appropriate activities to support acquired and emerging skills. (author abstract)