16 THE CAREER DEVELOPMENT QUARTERLY MARCH 2017 • VOLUME 65 © 2017 by the National Career Development Association. All rights reserved. An Individual Mixed-Evaluation Method for Career Intervention Philippe Jacquin and Jacques Juhel Economic issues linked to career counseling are a cause for concern to policy makers in developed countries because they expect career practitioners to provide evidence of the efficiency of career counseling interventions. The aim of this study was to test an individual evaluation method mixing time series (outcomes) and life narrative (processes). The method used 5 items related to 1 client’s career decision self-efficacy and studied the evolution of those items throughout the intervention of 1 career counselor (43 days). Changepoint analysis helped in identifying the changes that have to be taken into account for time series and which are contextualized in the client’s verbatim analysis. This mixed method highlighted that the career coun- selor’s intervention increased the client’s career decision self-efficacy. Practitioners could use the methodology proposed in this article to evaluate their interventions. They could also report their practice to clients, employers, and decision makers. Keywords: effectiveness of career counseling, single-subject mixed design, time series, life narrative, changepoint analysis, evidence-based practice Careers have been affected by economic globalization for 3 decades. Some workers previously in stable employment now have to deal with professional insecurity (Kalleberg, 2009). The digital revolution has questioned the traditional view of a linear career (Savickas, 2012). In fact, the number of jobs during one’s professional life is proportional to the number of professional transitions that a person undergoes. Con- sequently, the demand for career counseling is increasing in developed countries. According to the Organisation for Economic Co-operation and Development (2004a), economic issues linked to career counsel- ing have become a cause for concern to policy makers in these nations. As far as Europe is concerned, decision makers need to know whether career counseling helps people to manage their careers efficiently (Plant, 2012). In other words, they expect practitioners to provide evidence of the efficiency of career counseling interventions (Council of the European Union, 2008). Several North American meta-analyses have shown that career coun- seling is efficient and effective (Brown & Ryan Krane, 2000; Oliver & Spokane, 1988; Spokane & Oliver, 1983; Whiston, Sexton, & Lasoff, 1998). Research concerning the effectiveness of career counseling focuses on its outcomes and processes (Whiston & Oliver, 2005). According to the psychotherapy definition of Hill and Williams as cited in Heppner Philippe Jacquin, Faculty of Education, University of Moncton, New Brunswick, Canada; Jacques Juhel, Psychology, Cognition and Communication Research Centre, University of Rennes 2, Rennes, France. Correspondence concerning this article should be addressed to Philippe Jacquin, Faculty of Education, University of Moncton, 18 Antonine-Maillet Avenue, Moncton, New Brunswick, E1A-3E9, Canada (e-mail: jacquinphilippe@gmail.com). Received 04/02/15 Revised 10/06/15 Accepted 10/07/15 DOI: 10.1002/cdq.12077