The open-systems model of instructional development (ID) proposed for use in both educational and non-educational organizations is based on an extensive examination of ID, the systems and communication/consulting literature, and the results of a nationwide survey of 750 currently active ID professionals in both higher education and business/industry regarding ID process behaviors. The survey focused on 26 behaviors that may be practiced in the process of developing instruction. Respondents indicated the percentage of time they currently practice each behavior and the percentage of time they feel each behavior should be practiced under "ideal circumstances." Analysis of the 411 usable surveys received (69%) revealed that, while there are isolated differences between education and business respondents, both subgroups follow the same basic ID process, and respondents as a group believe that all 26 ID process behaviors should be practiced significantly more often than they currently are. Further research into the ID process is suggested, including field testing and validation of the proposed ID model. A 22-page bibliography and reference list, a glossary, the survey instrument, survey cover and follow-up letters, and correlation matrices are included. (Author/LMM)