Kendler addresses three basic and interrelated questions that face all psychologists: What is the subject matter of psychology? What are the criteria for understanding psychological events? What ethical principles underlie the use of psychological knowledge? "[The book's] structure.... only hints at the literate and responsible handling of these current issues.... [it] would be enjoyable to use in teaching." --Psychological Report.

The relationship between psychology and ethics is determined by whether psychology is conceptualized as a natural or a human science. If the former, then psychology is incapable of identifying universal moral imperatives because of the fact/value dichotomy that rejects the possibility of logically deriving moral principles or social policies from factual statements. In addition, the inevitability of moral pluralism raises the question as to how natural science methodology can select moral truths or social policies from a variety of presumed alternatives. (...) In contrast, human science psychology, which emphasizes phenomenological experience as a source of psychological truths, has attempted to bridge the fact/value gap. Upon close examination, this approach has failed to suggest a rule as to how the "correct" set of values can be identified. The conclusion is that facts cannot dictate moral principles or social policies but they can help illuminate their consequences. Policy decisions become the responsibility of a democratic society, not of psychology. (shrink)

A developmental study of free-classification behavior within the age range of 3-1/2 to 19 years indicates that categorical responses, which are characteristic of adult behavior, increase with age while overgeneralized responses, classifications including noncategorical instances, decrease with age. Overdiscriminated responses which are incomplete categorical classifications increase from 3-1/2 to 6 years and then decrease to 19 years of age. These results are discussed within a two-stage theory of conceptual development (Kendler, 1971).