This document, which is intended to serve as a guide for work force preparation program providers, details the Illinois occupational skill standards for programs preparing students for employment in jobs in occupational therapy. Agency partners involved in this project include: the Illinois State board of Education, Illinois Community College Board, Illinois Board of Higher Education, Illinois Department of Commerce and Community Affairs, and the Illinois Department of Employment Security. The document begins with a brief overview of the Illinois perspective on occupational skill standards and credentialing, the process used to develop the skill standards, and assumptions underlying the standards. Presented next are skill standards for 96 tasks typically performed by occupational therapy assistants and occupational therapy aides. Each skill standard statement contains the following components: (1) the actual skill standard (including the conditions of performance, work to be performed, and performance criteria); (2) performance elements; and (3) performance assessment criteria. The following are among the categories of tasks for which skill standards are provided: service management; supplementary (nonbillable) client care services; supervision; communication; support services; data collection; occupational therapy interviews; and occupational therapy interventions for activities of daily living, work and productive activities, play or leisure activities, sensorimotor integration, cognitive integration, and psychosocial awareness. Appended are the following: glossary; lists of Illinois Occupational Skill Standards and Credentialing Council, Health and Social Sciences Subcouncil, and Occupational Therapy Cluster Standards Development Committee members; and list of necessary workplace skills. (MN)