Presented are lesson plans for a unit on color discrimination for trainable mentally retarded (TMR) children. An introduction describes TMR children and the major educational objectives of self care, social adjustment, and economic usefulness. Criteria of effective units such as relationship to real life situations are listed. Specific unit objectives for the areas of color discrimination, muscular coordination, sensory discrimination, arithmetic, health, language, self care, music, and crafts are outlined. It is recommended that the unit's activities be correlated with the normal day's activities and a theoretical daily schedule is provided. Detailed are lesson plans for the first 11 days of the unit which center on discrimination of red and blue through activities such as stories, games, conversation, and songs. Briefly covered are teaching suggestions for the other six colors. Guidelines for evaluation include use of continuous reports and charts during the unit's progress. A bibliography lists 17 books appropriate for teachers of the TMR, 6 books for children, a song book, and 13 stories to be read to children. Appended are a listing of instructional materials, an evaluation form, the text of a story, and patterns for crafts activities. Also included is a listing of 16 other papers available in the series of technical reports. (DB)