Examines and rejects common criticisms of the causality concept; shows causality is a relation implied in the grammar of a language about objects. Discusses objective criteria for concepts of causal relations and explains how the concept of causality may be modified to have causes determine probabilities of outcomes. (Author/RH)

In response to Hallahan et al, the authors suggest that variability in prevalence is a function of the methods used to examine prevalence differences and that the effect specific discrepancy criteria for learning disabilities have on the number of students identified is the critical issue. (Author/DB)

Acquiescence, or acquiescent responding, is reviewed. A detection method using the concept of differential person functioning is illustrated with two data sets. The effects of acquiescence are shown to be different for each example. Implications for questionnaire and attitudinal scale development are discussed and an operational definition for…

Litigation that has arisen from claims of discrimination is discussed along with the notion that there is a clear lack of understanding of the laws and statutes. Legal models of proof and the major statutes under which litigation can be brought are described. (MLW)

Research which makes possible a quantification of the size, composition, and growth of the underclass is discussed. Trends in the quality of life and the growth of the underclass are presented. (CW)