As theory-based evaluation (TBE) engages in situations where multiple stakeholders help develop complex program theory about dynamic phenomena in politically contested settings, it becomes difficult to develop and use program theory without ambiguity. The purpose of this article is to explore ambiguity as a fruitful perspective that helps TBE face…

Qualitive data from interviews with individuals and observations of group meetings were gathered from 16 school districts that participated in a study of school district uses of evaluation and test data. The findings are organized around a series of discrete topics presented in a set of independent papers. The title essay, "Working Knowledge,"…