The purpose of this research was to develop, test, and demonstrate a systematic methodology of triangulation. Triangulation is a technique used to establish credibility of data gathered in qualitative ways. Triangulated conclusions are more stable than any of the individual vantage points from which they were triangulated. Using a previous study as an example--an ethnographic study of two elementary schools in Suffolk County, Long Island, New York, by Rosenbaum--the triangulation method is demonstrated in terms of method and findings. It is concluded that triangulation techniques are essential to making the kinds of informed judgments that qualitative researchers are called upon to make. Post-hoc triangulation, as used in this study, is not as effective as when the triangulation design is part of the original plan for research. Appended are 13 references, a table, and first- and second-order scores for the school work environment. (SI)