Article A Test of the Career Construction Theory Model of Adaptation in Adult Workers With Chiari Malformation David M. Tokar 1 , Mark L. Savickas 2 , and Kevin P. Kaut 1 Abstract The present study examined the career construction theory (CCT) model of adaptation using a sample of working adults diagnosed with Chiari malformation. Specifically, we tested a mediation model in which adaptivity (i.e., proactivity, openness, and conscientiousness) fosters adaptability, which conditions adapting (i.e., competence need satisfaction at work), which leads to adaptation (i.e., work well-being and subjective well-being). Results of structural equation modeling supported all of the hypothesized direct and indirect relations between CCT constructs, thus providing strong support for the applicability of the model of adaptation among workers with Chiari malformation. Prior to testing the model of adaptation, we examined and found support for the hypothesized hierarchical structure of the Career Adapt-Abilities Scale–Short Form, a recently developed operationalization of career adaptability. Keywords career adaptability, career construction theory, Career Adapt-Abilities Scale—Short Form, Chiari malformation Career construction theory (CCT; Savickas, 2005, 2013) conceptualizes human development as driven by adaptation to a social environment with the goal of person–environment integration. Viewing career construction as a series of attempts to fit a self-concept into work roles concentrates attention on adaptation to repeated transitions and challenges from school to work, from job to job, and from occupation to occupation. This adaptation is motivated and guided by the goal of bringing inner needs and outer opportunities into harmony. In keeping with CCT’s stated emphasis on coping with tasks, transitions, and traumas in occupational roles (Savickas & Porfeli, 2012), we tested the applicability of the CCT model of adaptation in a unique sample of workers for whom adaptive challenges are a well-understood part of their employment trajectory (Fischbein et al., 2015; Tokar 1 Department of Psychology, University of Akron, Akron, OH, USA 2 Department of Family and Community Medicine, Northeast Ohio Medical University, Rootstown, OH, USA Corresponding Author: David M. Tokar, Department of Psychology, University of Akron, 290 E. Buchtel Ave., Akron, OH 44325, USA. Email: dmt5@uakron.edu Journal of Career Assessment 1-21 ª The Author(s) 2019 Article reuse guidelines: sagepub.com/journals-permissions DOI: 10.1177/1069072719867733 journals.sagepub.com/home/jca