A wide variety of techniques and classroom activities, contributed by teachers, for content-based instruction (CBI) in English as a second language (ESL) are presented. CBI is defined to include theme-based second language courses, sheltered content-area courses, and paired or adjunct arrangements in which language and content courses are taught in tandem with mutually negotiated objectives. Ideas are included for all instructional levels, from elementary to higher education, and that are generalizable to other settings, levels, teaching purpose, or audience. The ideas are divided into these groups: (1) information management (sifting data into categories or finding examples, arriving at category names, identifying similar characteristics within a category); (2) critical thinking (going beyond simple classification to evaluate or analyze data); (3) hands-on activities (manipulating information using games, experiments, and other activities); (4) data gathering (collecting and assembling facts, data, and references or scanning for specific information); and (5) text analysis and construction (breaking text into component parts, elucidating rhetorical pattern, and examining text flow, or applying knowledge of oral and written discourse conventions to create a specifically patterned text with a goal of increasing fluency, accuracy, or both.