Data from international comparative studies in education are generally derived from complex, multi-stage sample designs and rotated assessments. Consequently, care must be taken not only in estimating variance components but also in interpreting them. Target population definitions, the nature of the sampling stages and their sampling units, and…

Ten evaluation models are examined in terms of their applicability to investigative, emergent design programs: Stake's portrayal, Wolf's adversary, Patton's utilization, Guba's investigative journalism, Scriven's goal-free, Scriven's modus operandi, Eisner's connoisseurial, Stufflebeam's CIPP, Tyler's objective based, and Levin's cost…

The curriculum development effort that stemmed from Project Head Start's "Strategy for Spanish-Speaking Children," the evaluation results, and policy implications for national efforts in bilingual education are discussed. (Author/LC)

The influence of two studies--the Westinghouse-Ohio and Consortium for Longitudinal Studies evaluations--on Project Head Start are discussed. The associations of one evaluation with program contraction and the other with program expansion are analyzed in terms of differences in findings, study credibility, climate of opinion, and dissemination of…