The problem and the solution . The workforce of the 21st century is in a continual state of flux. This has created a need by human resource development scholars and practitioners to continue to review best practices in developing a workforce with the latest technology, knowledge, and expertise. Revisiting traditional training models and processes is important as a means of moving forward. Although there are many system models, almost all are based on the generic analysis, design, develop, implement, and evaluate (ADDIE) model that evolved from instructional systems research following World War II. The purposes of this article are to (a) reacquaint the profession with the background and basic concepts of the traditional ADDIE model and (b) compare the original and revised ADDIE models. Subsequent articles in this volume deal with issues and advancements surrounding ADDIE and the ADDIE phases.

The problem and the solution. Given the many organizational problems human resource development is expected to help solve and the many tools offered by economics, foundational direction for action can have high utility. This article concludes this issue by discussing the opportunity and challenges facing human resource development scholars and practitioners in integrating economics foundations into its theory building, research, and practice along with the potential gains.

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