The Involvement Instrument, an observational technique for examining children's interaction patterns and degree of involvement within the school setting, is presented in this paper. Training protocols for obtaining skill in using the Involvement Instrument, methods of analyzing data obtained by using the instrument, and criteria for determining inter-observer reliability when using the technique are also included. The Involvement Instrument is reproduced in its entirety, including extensive descriptions of verbal and nonverbal behavior categories to be observed (with appropriate examples) and coding sheets. Behaviors are coded sequentially. A final section suggests possible uses for the Involvement Instrument (e.g., to determine how a child's indicators of involvement vary with different activities and times of day). (ED)