Changing Behavior Using Integrated Theories

Psychologists increasingly recommend experimental analysis of mediation. This is a step in the right direction because mediation analyses based on nonexperimental data are likely to be biased and because experiments, in principle, provide a sound basis for causal inference. But even experiments cannot overcome certain threats to inference that arise chiefly or exclusively in the context of mediation analysis-threats that have received little attention in psychology. The authors describe 3 of these threats and suggest ways to improve the exposition and design of mediation tests. Their conclusion is that inference about mediators is far more difficult than previous research suggests and is best tackled by an experimental research program that is specifically designed to address the challenges of mediation analysis.

The 5-factor approach (FFA) to personality description has been represented as a comprehensive and compelling rubric for assessment. In this article, various misgivings about the FFA are delineated. The algorithmic method of factor analysis may not provide dimensions that are incisive. The "discovery" of the five factors may be influenced by unrecognized constraints on the variable sets analyzed. Lexical analyses are based on questionable conceptual and methodological assumptions, and have achieved uncertain results. The questionnaire version of the FFA has not demonstrated the special merits and sufficiencies of the five factors settled upon. Serious uncertainties have arisen in regard to the claimed 5-factor structure and the substantive meanings of the factors. Some implications of these problems are drawn.