The first part of the book focuses on three types of validity: external, construct and statistical. Much attention is given to meta-analysis, statistical testing and effect sizes.
The second part is a major critique of Campbell's vision and practice of social experimentation. Contributors review and extend Campbell's ideas, concentrating on their relevance to evaluation and social intervention, and seeking to define an 'experimenting society.'
|A Significant (p 05) Problem|
|Estimation and Interpretatio|
|Sites and Other Entities as the Unit of Allocation and Analysis|