My past efforts have focused on program evaluation theory and practice, and qualitative research methods including case study.

I am currently involved in performance assessment in New York City schools and the evaluation of training in the U.S. Veterans Administration.

Since 1975 I have been director of the Center for Instructional Research and Curriculum Evaluation (CIRCE). Once a specialist in psychometrics and instructional research, my present orientation is naturalistic or ethnographic field study, particularly of the classroom. In 1998 I retired from the University of Illinois but continue to teach and head CIRCE.