Presents empirically based recommendations to facilitate the effectiveness of career counseling and career development interventions. Previous evaluations of career interventions are reviewed. The majority of such evaluations focused on only one type of intervention, often not including a control group and only rarely attending to client attributes that might differentially affect the results of the intervention. The present review focuses on all of those evaluations that examined (a) the influence of client attributes on outcomes and/or (b) the differential effects of 2 or more interventions. Reviews of the literature evaluating the effectiveness of educational instruction and psychotherapy provide the empirical bases for specifying contrasting parameters of interventions, and demographic and psychosocial characteristics of participants that may moderate the effectiveness of diverse types of interventions. Recommendations are provided for designing evaluation studies incorporating cost–benefit analyses and for determining the effects of client attributes and differential treatment parameters. (3 p ref)