The integrity of independent variables in behavior analysis

Establishing a functional relationship between the independent and the dependent variable is the primary focus of applied behavior analysis. Accurate and reliable description and observation of both the independent and dependent variables are necessary to achieve this goal. Although considerable attention has been focused on ensuring the integrity of the dependent variable in the operant literature, similar effort has not been directed at ensuring the integrity of the independent variable. Inaccurate descriptions of the application of the independent variable may threaten the reliability and validity of operant research data. A survey of articles in the Journal of Applied Behavior Analysis demonstrated that the majority of articles published do not use any assessment of the actual occurrence of the independent variable and a sizable minority do not provide operational definitions of the independent variable. The feasibility and utility of ensuring the integrity of the independent variable is described.