These materials form a service unit for students in grade seven science courses in Australian secondary schools. The teacher's guide lists the expected knowledge, skills, and attitudinal outcomes; suggests methods of facilitating student investigation; lists materials needed for each activity; and suggests additional references for student and teacher. One of the pupil books contains instructions for activities concerned with the estimation and measurement of volume, length, temperature, and time. Answers to questions and records of activities are made in a pupil record book, which also contains summaries of the important ideas that are expected to be developed. There is a self-administered diagnostic test with comments on each choice in a separate answer section. (This first trial version is of marginal legibility and is not available from EDRS.) (AL)