title: Probing the effects of individual components in multiple component prevention programs.
abstract: Assessing the contributions of individual components in multi-component interventions poses complex challenges for prevention researchers. We review the strengths and weaknesses of designs and analyses that may be useful in answering three questions: (1) Is each of the individual components contributing to the outcome? (2) Is the program optimal? and (3), Through what processes are the components of the program achieving their effects? Factorial and fractional factorial designs in which a systematically selected portion of all possible treatment combinations is implemented are used to address question 1. Response surface designs in which each component is quantitatively scaled are explored in relation to question 2. Mediational analysis, a hybrid of experimental and correlational approaches, is considered in relation to question 3. Design enhancements are offered that may further strengthen some of these techniques. These techniques offer promise of enhancing both the basic science and applied science contributions of prevention research.
authors.affiliation: Department of Psychology, Arizona State University, Tempe 85287-1104.
authors.forename: S G
authors.initials: SG
authors.lastname: West
authors.forename: L S
authors.initials: LS
authors.lastname: Aiken
authors.forename: M
authors.initials: M
authors.lastname: Todd
mesh_terms: D003131:Combined Modality Therapy; D003156:Community Mental Health Services; D006801:Humans; D001523:Mental Disorders / Q000517:prevention & control* / Q000523:psychology; D010043:Outcome and Process Assessment, Health Care; D012106:Research; D012307:Risk Factors