Teachers' decisions are based on certain criteria which teachers believe can justify what happens in their classes. Identifying and measuring those criteria requires multiple approaches in order to triangulate the data as thoroughly as possible. In one case study of a fourth grade teacher, a repertory grid technique was used as the format for a series of in-depth interviews to supplement classroom observations and other interview data. Each subsequent interview generated an increasingly evolved description of teaching that revealed interesting and new associations when the same information was presented to the teacher in a different format. A variety of explanations for the new perspectives are presented, along with recommendations for future research.Teacher thinking can be viewed from both the hypothetical stance as well as from verifiable rationales about teachers' choices and behaviors. Hypothetical stances, for example, can generate from teachers' applying theory to case study samples (McAninch, 1993), or from interpreting videotaped classroom vignettes (Copeland et al., 1994). This hypothetical perspective is common for in-service teachers and trainees. The other, more verifiable view derives from teachers who predict their own thinking and decisions and then analyze their own video-taped teaching, or respond to actual classroom observers who seek supporting evidence for teacher assertions through classroom observations (Morine-Dershimer, 1983;Nespor, 1987). Some studies ask teachers to hypothetically analyze their own teaching, without observation evidence for corroboration (Ben-Peretz, 1984;Munby, 1982;Olson, 1981).Many such analyses result in a list of categories, or criteria, that justify the behaviors and teachers' decisions that occur in the classroom (Clandinin & Connelly, 1987). These categories are often generated and labeled by the teachers themselves, language that provides great insight into the minds of teachers and the way they think. Therefore, in order to delve into the mind of a teacher, attending to the actual wording of her responses as well as to the content of her self-analysis is crucial.The present case study demonstrates a tangible view of one elementary school teacher. The main purpose was to elicit the specific topics that played 440 a conscious role in her thinking, planning and decision-making across her school day. This paper presents findings from one case study teacher, examples of certain discrepancies that occurred between some stated beliefs and my own observations, possible explanations for those discrepancies, and recommendations for future research using the data-gathering techniques.