The purpose of this Child Development Associate (CDA) training module is to enable trainees to recognize and correct unsafe and unhealthy conditions in the preschool setting. After completing this module the trainee will be able to provide appropriate light, temperature and ventilation in the preschool. The trainee will be able to appropriately correct or recommend for correction those conditions in the physical environment which do not meet state and local standards for health and safety. Instructional and behavioral objectives for learning activities are given. The teacher's materials include an instructor's activity outline, a set of instructor's directions, and an activity scoresheet. The student's materials include an activity list, a glossary, a unit overview, and instructional materials such as welfare regulations for licensed centers and environment assessment guidelines. Directions for student activities are provided along with scoresheets and observation forms. (Author/RH)