Teachers' decisions are based on certain criteria which teachers belie
ve can justify what happens in their classes. Identifying and measurin
g those criteria requires multiple approaches in order to triangulate
the data as thoroughly as possible. In one case study of a fourth grad
e teacher, a repertory grid technique was used as the format for a ser
ies of in-depth interviews to supplement classroom observations and ot
her interview data. Each subsequent interview generated an increasingl
y evolved description of teaching that revealed interesting and new as
sociations 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.