Collaborative Evaluation systematically invites and engages stakeholders in program evaluation planning and implementation. Unlike "distanced" evaluation approaches, which reject stakeholder participation as evaluation team members, Collaborative Evaluation assumes that active, on-going engagement between evaluators and program staff,…

Articles in this special issue suggest improvements in longitudinal program evaluation to meet the challenges of evaluation of human services programs. Contributions describe innovations in design, methods, data analysis, utilization, and interpretation of the findings of longitudinal studies. (SLD)

Structural equation models reanalyzed data from the 1969 Westinghouse Head Start evaluation and extended the analysis to blacks and full-year programs. Results showed that the selection bias for summer program whites was absent for blacks and full-year program whites, and that Head Start helped the most disadvantaged children. (SLD)

Conditions influencing conduct and impact of state-level program evaluation are explored. A model is offered as a guide for assessing conduct and impact, and its use is demonstrated by a case study contrasting the approaches of two states examining an issue raised by the Federal Health Care Financing Agency. (SLD)