These workbooks aim to help adult learners develop their vocabulary through reading passages written at an appropriate level. The workbooks are organized around four themes: health, wildlife, the environment, and popular culture. Each lesson presents a non-fiction passage and a set of activities that relate to one of the four themes. Because repetition is essential for vocabulary development, each lesson presents five activities that focus on the new words. Added features include crossword puzzles, word searches, and a glossary. Each workbook contains an answer key. The workbooks target the following reading levels: Boosters 1 (Grades 3-4); Boosters 2 (Grades 5-6); Boosters 3 (Grades 7-8).