IntroductionPsychology and the Discipline of HRDContributed by Elwood F. Holton III, Louisiana State UniversityEconomics, Human Capital Theory, and HRDContributed by Richard J. Torraco, University of NebraskaSystems Theory as a Foundation for HRDContributed by Wendy E. A. Ruona, University of GeorgiaConclusionReflection Questions