This article is a report of efforts to simultaneously conceptualize and measure the dimensions of project performance and their determinants. The context of the study was a larger organizational development (OD) effort intended to increase the effectiveness of project groups in a high technology matrix organization. The location of the study was the R&D division (entitled the Technical Staffs Division of TSD) of a major U. S. Company engaged in the manufacture and marketing of highly sophisticated products for industrial and consumer use. The division is organized along functional lines (e. g. , chemical research, physical research, etc. ) and employs in excess of 800 people, approximately one-half of whom are scientists and engineers.