This document, ninth in a series of 11 subvolumes of a handbook prepared to providing training for educational research and development personnel, deals with the task of developing instructional materials. The document is organized according to the sequential steps involved in performing the task. Step 1, planning the size and order of learning units, involves: (a) estimating how many parts of the criterion behavior can be effectively practiced at the same time and (b) planning the order in which parts of the criterion behavior will be practiced. Step 2, preparing instructional materials procedures, involves preparing instructional materials or procedures integrating all subcriterion behaviors that make up the criterion behavior. Background information is included for both steps. (PD)