Attrition is a major problem in construction skills training programs for young adults, with dropout rates ranging between 45% and 65%. Training resources could be used more efficiently if trainees' completion rates were increased. Understanding and measuring the psychological characteristics contributing to attrition allows training practitioners to implement interventions to reduce dropout. This article reports the development of an instrument designed to measure constructs that inform participants' performance and success within the construction training domain. Instrument reliability and validity as well as areas of further research are discussed.