A challenge for career theory informed by constructivism is how to apply it in practice. This article describes a career counseling intervention based on the constructivist Systems Theory Framework (STF) of career development and the qualitative career assessment instrument derived from it, the My System of Career Influences (MSCI; M. McMahon, W. Patton, & M. Watson, 2005a, 2005b; M. McMahon, M. Watson, & W. Patton, 2005) refection process. The article provides an overview of the STF, describes the MSCI, and illustrates the application of the MSCI in a counseling process with an adolescent. (Contains 2 figures.)