Written in response to George Fairweather's position concerning the use of experimental studies in evaluation, this paper highlights considerations in deciding when experimental procedures are feasible. The current debate on the use of experimental methods in evaluation is reviewed. (Author/GK)

The main features of a multiple site, structured case study design are presented. The nature of explanatory patterns, how case study investigators pursue and recognize valid patterns, and how an analyst can apply the same logic to cross-site analysis are discussed. (Author/BW)

Studies examining the effectiveness of early intervention for infants and children with organic impairment and and developmental delay were reviewed using recently developed quantitative methods. Results suggest an accurate interpretation of the early intervention research literature cannot be made without consideration of specific design…

In reexamining the implementation results from a true experiment in criminal justice, this analysis brackets true treatment effects by partitioning experimental and control groups into treated and untreated subgroups and by combining two independent data sources. A positive association was found between magnitude of experimental treatment…

The authors respond to criticism and analyses by Eva Rezmovic (TM 507 851) of their experimental design, particularly the suggested use of information on the amount of program service received by the control group comparable to the treatment group in their study of the relationship between program implementation levels and program outcomes. (CM)