PsyCap is not a vague or unscientific concept: to be included in PsyCap, a given positive construct must be based on theory, research, and valid measurement, must be open to development, and must have measurable performance impact. The positive constructs that have been determined to best meet these PsyCap criteria, efficacy (confidence), hope, optimism, and resiliency.

After exploring other potential positive constructs such as creativity, wisdom, well being, flow, humor, gratitude, forgiveness, emotional intelligence, spirituality, authenticity, and courage, the authors summarize the research demonstrating the performance impact of PsyCap. They go on to provide the PsyCap Questionnaire (PCQ) as a measurement tool, and the PsyCap Intervention (PCI) as a development aid.

Utility analysis indicates that investing in the development of PsyCap can result in a very substantial return. In total, Psychological Capital provides theory, research, measurements, and methods of application for the new resource of psychological capital, a resource that can be developed and sustained for competitive advantage.

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