These skill standards, developed through a consortium of educational and industry partners in Illinois, serve as guides to workforce preparation program providers to define content for their programs and to employers to establish the skills and standards necessary for job acquisition and performance. The skill standards include the following components for each skill defined: performance area; performance skill; skill standard; and performance elements and assessment criteria. This publication contains skill standards for physical therapist assistants defined on these two levels of difficulty: physical therapist assistant and physical therapy aide. The skill standards are grouped in the following areas: (1) administrative and clerical functions; (2) communication; (3) support services; (4) patient care services; (5) assessment and data collection; (6) physical therapy interventions; and (7) physical agents and mechanical modalities. Each area contains 6-23 standards. The following items are appended: glossaries; lists of Illinois Occupational Skill Standards and Credentialing Council, Health and Social Services Subcouncil, and Physical Therapist Assistant Cluster Standards Development Committee members; Health and Social Services Subcouncil Physical Therapist Assistant Cluster Skill Standards Recognition Proposal; and a list of workplace skills. (KC)