This document, which is intended for workforce preparation program providers, details the Illinois Occupational Skill Standards for programs preparing students for employment as chemical process technical operators. 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 32 tasks performed by chemical process technical operators. Each skill standard statement contains the following components: (1) the skill standard (including the conditions of performance, work to be performed, and performance criteria); (2) performance elements and assessment criteria; and (3) a recommended assessment and credentialing approach. The standards are grouped into the following categories: maintain safety, health, and environmental standards in the plant; handle, store, and transport chemical materials; operate, monitor, and control continuous and batch processes; provide maintenance and service to processes, equipment, and instrumentation; analyze plant materials; and participate in improvement and training activities. Appended are the following: glossary; lists of Illinois Occupational Skill Standards and Credentialing Council, Manufacturing Subcouncil, and Chemical Process Technical Operators Standards Development Committee members; Manufacturing Subcouncil Chemical Process Technical Operators recognition proposal; and a list of workplace skills. (MN)