Presented is a guide for helping secondary school students investigate the litter problem, acquire litter control skills, and develop an anti-litter ethic. The manual contains a hierarchy of learning objectives, a pretest/posttest, background information on litter, and activities keyed to the learning objectives. Each lesson includes brief statements of content, instructional activities, and assessment tasks. Provided in the appendix are a glossary, a list of organizations and agencies involved in litter control, supplementary mathematics problems, and more than 20 litter-related activities appropriate for any subject area. (WB)