This document, one part of a project to train personnel for educational development and evaluation, presents the rationale underlying the training procedure. The presentation is organized around conceptualizations of the knowledge and skills required by development and evaluation personnel. Papers treat conceptually many instructional objectives and terminal behaviors as guidelines for developers and evaluators. The objectives outlined will eventually be organized into training materials for evaluation personnel and into sequences for research, development, and diffusion. Related documents are EA 003 900, EA 003 902, and EA 003 903. (RA)