The construct of Psychological Capital ( Psy Cap) focuses on the positive psychological capacities of self-efficacy, hope, optimism and resilience and their relationship with a range of desirable work attitudes, behaviours and organizational outcomes. There is now almost a decade of accumulated Psy Cap research. However, a critical and synthesized analysis of the construct in terms of its theoretical conceptualization and psychometric properties is yet to appear in the literature. Consequently, this article aims to provide a comprehensive review and analysis of the Psy Cap literature, focusing in particular on issues relevant to the psychometric profile of Psy Cap as it is currently assessed. Six directives for advancing Psy Cap research are proposed as part of an integrated research agenda aimed towards strengthening the conceptualization and measurement of Psy Cap. Practitioner points This article provides a critical and synthesized psychometric-focused review of the PsyCap construct and its application in the workplace., Several shortcomings of the construct and its primary measure are highlighted., Directives are proposed to further enhance the conceptualization and measurement of the construct and thus enhance its utility in the workplace. [ABSTRACT FROM AUTHOR]