Evaluation research is discussed as an applied social science that uses quantitative-comparative techniques to assess the effects of planned intervention. Focus is on the generally insufficient validity of treatment effectiveness research, and the relationship between research constructs and theory and their operationalization. (TJH)

School psychologists can play a unique role in schools because of their assessment expertise. Traditionally, they have been most involved in individual psychoeducational assessment for classification and labeling purposes, but the limitations of this form of assessment for building intervention strategies has led many school psychologists to…