The Pupil Behavior Inventory was developed to infer learner self concept from teachers' ratings of eighteen items related to a pupil's overt classroom behavior. Split-halves reliability estimates for eleven teachers was 0.93 and reliability of the total score means of three raters for eleven students was 0.84. Four areas related to self concept as learner were identified from a factor analysis and were labelled: 1) Relating 2) Asserting 3) Investing 4) Accomplishing. Advantages of the instrument are: ease of scoring, non-reactivity with the pupil, measurement of self concept of early elementary pupils, as well as older pupils, and measurement of public behavior. Preliminary and revised versions of the instrument are included in the appendix. (Author/CK)