REG NASA-LLIS-1062-1998 Lessons Learned International Space Station (ISS) Program Computer Hardware-Software Software.pdf

1、Lessons Learned Entry: 1062Lesson Info:a71 Lesson Number: 1062a71 Lesson Date: 1998-02-01a71 Submitting Organization: HQa71 Submitted by: David M. LengyelSubject: International Space Station (ISS) Program/Computer Hardware-Software/Software Description of Driving Event: International Space Station (

2、ISS) Software Development ScheduleLesson(s) Learned: The ISS software development schedule is almost impossibly tight. If something else does not cause a further delay in ISS deployment, software development may very well do so. The decision this year to add integrated testing of some modules at KSC

3、 is a very positive step for safety. However, there is no room in the schedule for required changes that may be discovered during this testing.Recommendation(s): NASA should realistically reevaluate the achievable ISS software development and test schedule and be willing to delay the ISS deployment

4、if necessary rather than potentially sacrificing safety. Evidence of Recurrence Control Effectiveness: The Program has established an aggressive activity to integrate developer schedules with need dates (including training as well as test). Schedules are difficult but proving to be achievable. Any d

5、isconnect, whether it is schedule or content, is tracked and worked through the Programs formal decision process on a daily basis. Staffing is reviewed weekly and will be sustained to meet commitments. Additional independent verification and validation and software assurance support has been added.

6、The program is firmly committed to our test plans and will make the appropriate schedule adjustments to maintain these plans. The recently approved Revision D to the ISS assembly sequence provides additional schedule flexibility to accomplish all testing and software activities. Finally, the program

7、 will not commit to flight until the software has been adequately tested.Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Documents Related to Lesson: N/AMission Directorate(s): a71 Space Operationsa71 Exploration SystemsAdditional Key Phrase(s): a71

8、Aerospace Safety Advisory Panela71 Information Technology/Systemsa71 Policy & Planninga71 Research & Developmenta71 Risk Management/Assessmenta71 Safety & Mission Assurancea71 Softwarea71 Spacecrafta71 Test & VerificationAdditional Info: Approval Info: a71 Approval Date: 2001-12-14a71 Approval Name: Bill Loewya71 Approval Organization: HQa71 Approval Phone Number: 202-358-0528Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-