This report is the first completed study from a larger project called Teacher Aides in a Secondary School. Pupils in 55 seventh-grade public school classes completed the Pupil Observation Survey Report (POSR) twice--once to describe their student teacher and once to describe the regular (cooperating-supervising) teacher. All teachers involved were female. Analyses of variance of the six factor dimensions of the POSR indicated that the student teachers were seen as more friendly, cheerful, lively, interesting, and directive, but as less poised, knowledgeable, and firmly controlling than their supervisors. The difference in general evaluation of the two groups was not significant. Correlations between the POSR scores of the student teachers and their supervisors were significant only for the factors called Non-Directive (r=.57) and Firm Control (r-.29). These results are consistent with the hypothesis that the regular teachers "set" the classroom atmosphere and activity structure before the student teacher arrives on the scene to handle the class by herself. The findings are relevant to any research employing pupil evaluation of teacher behavior and support the validity of the POSR as a specific tool for such measurement. (Author)