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The problem and the solution. Holton proposed the HRD Evaluation and Research Model as a comprehensive framework for diagnosing and understanding the causal influences of HRD intervention outcomes. Unfortunately, a full test of Holton's model has not been possible because tools to measure the constructs in the model did not exist. This article reviews recent studies relevant to the constructs in Holton’s model and updates it by delineating specific constructs that should be measured in each of the conceptual categories proposed.
Elwood F. Holton (Thu,) studied this question.