Accession Number:

ADA464876

Title:

Applying a Formal Requirements Method to Three NASA Systems: Lessons Learned

Descriptive Note:

Corporate Author:

NAVAL RESEARCH LAB WASHINGTON DC

Report Date:

2007-01-01

Pagination or Media Count:

11.0

Abstract:

Recently, a formal requirements method called SCR Software Cost Reduction was used to specify software requirements of mission-critical components of three NASA systems. The components included a fault protection engine, which determines how a spacecraft should respond to a detected fault a fault detection, isolation and recovery component, which, in response to an undesirable event, outputs a failure notification and raises one or more alarms and a display system, which allows a space crew to monitor and control on-orbit scientific experiments. This paper demonstrates how significant and complex requirements of one of the components can be translated into an SCR specification and describes the errors detected when the authors formulated the requirements in SCR. It also discusses lessons learned in using formal methods to document the software requirements of the three components. Based on the authors experiences, the paper presents several recommendations for improving the quality of requirements specifications of safety-critical aerospace software.

Subject Categories:

  • Computer Programming and Software

Distribution Statement:

APPROVED FOR PUBLIC RELEASE