1、Lessons Learned Entry: 0582Lesson Info:a71 Lesson Number: 0582a71 Lesson Date: 1997-09-26a71 Submitting Organization: JPLa71 Submitted by: K. Clark/D. OberhettingerSubject: Informal Design Reviews Add Value to Formal Design Review Processes (1996) Abstract: A study supports the premise that informal
2、 peer review is valuable in ensuring that the appropriate level of technical penetration is attained during interrogation of designs. Refocus formal design reviews towards more programmatic issues and implement informal technical peer reviews staffed by competent designers and engineers who are not
3、all directly involved in the design being reviewed.Description of Driving Event: A JPL study of inflight problems (see reference below) on Voyager I and II, Magellan, and Galileo (up to late 1993) revealed that 40% would likely have been identified by better technical penetration in reviews of the d
4、etailed designs performed well before launch. An additional 40% (for a total of 80%) might also have been found by similarly in-depth reviews. As a result, JPL adopted the informal peer review process in order to ensure that the appropriate level of penetration was obtained by technical personnel qu
5、alified to adequately interrogate the designs.Informal peer reviews were conducted for the Mars Pathfinder, Mars Global Surveyor, and Cassini projects. Formal presentations were de-emphasized. Informal, but in-depth, discussions of requirements and designs were a more typical activity. Over the cour
6、se of these projects, JPL review board membership was composed of technical peers with recent, directly applicable, subsystem experience. Peer reviewers were selected based on their knowledge of what questions to ask, how to probe an issue, and when an answer is satisfactory.Since formal reviews emp
7、hasize verification of the project status and attainment of milestones, their chief benefit lies in the investigative work performed in preparation for the review. In contrast, informal reviews feature detailed value-added engineering analysis, problem solving, and peer review.Provided by IHSNot for
8、 ResaleNo reproduction or networking permitted without license from IHS-,-,-Reference(s): JPL D-11381, Flight P/FRs and the Design Review ProcessLesson(s) Learned: Informal system and lower level design reviews can result in a superior design process which enables formal project reviews to be more f
9、ocused on programmatic issues.Recommendation(s): Refocus formal design reviews towards more programmatic issues and implement informal technical peer reviews staffed by competent designers and engineers who are not all directly involved in the design being reviewed.Evidence of Recurrence Control Eff
10、ectiveness: N/ADocuments Related to Lesson: N/AMission Directorate(s): N/AAdditional Key Phrase(s): a71 Administration/Organizationa71 Policy & PlanningAdditional Info: Approval Info: a71 Approval Date: 1998-03-03a71 Approval Name: Carol Dumaina71 Approval Organization: JPLa71 Approval Phone Number: 818-354-8242Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
