Development of technologically complex products requires systematic mo
nitoring of technical risk and of the pace and quality of technology m
aturation as product development proceeds (1-5). This article presents
lessons from a case study of technology development for two products
during the second half of the 1980s at Xerox. If describes a method of
analysis that was devised for monitoring the pace and quality of tech
nology delivery. It also examines the root causes of departures from t
he planned schedule, and extracts generalized countermeasures useful t
o future product development teams. These suggestions am codified in a
checklist for certain technology mileposts, especially those early in
the product development schedule. Suggestions are made for a method t
o assess technology risk.