J.M. Rushby. Formal methods and their role in digital systems validation for airborne systems. Technical report, SRI International, Menlo Park, California, CSL-95-01, March 1995.  Home/Search   Document Not in Database   Summary   Related Articles   Check

....from SRI. Our work was performed in the context of a broad program of applied formal methods activity at NASA s Langley Research Center (LaRC) 2] Additional background and overview material on the use of formal methods in aerospace applications can be found in Rushby s formal methods handbooks [18,19], and in the previously mentioned guidebook volumes [14,15] 2 Overview of SAFER SAFER is a small, self contained, backpack propulsion system enabling free flying mobility for a crew member engaged in extravehicular activity (EVA) SAFER is a single string system designed for contingency use ....

John Rushby. Formal methods and their role in digital systems validation for airborne systems. NASA Contractor Report 4673, August 1995.

.... experience reports: 14, 16, 17, 34] ffl Reference books on particular formal methods: Z [33] VDM [21] B [1, 24] Object Z [12] for object oriented specifications refinement of specifications to code [28] Cogito [5] Spark Ada [9] ffl Use of formal methods in aerospace: [32] ffl Use of formal methods in Human Computer Interface design: 18] ffl Formal reasoning: 3, 4] ffl Tool support: 5, 20, 22, 25, 26, 31] ffl Recent developments and future directions: 10, 13, 15] SVRC technical reports can be obtained electronically from http: svrc.it.uq.edu.au ....

J. Rushby. Formal methods and their role in digital systems validation for airborne systems. NASA Contractor Report 4673, August 1995.

....It requires great skill to address these problems using formal methods, but the number and size of these problems may not be large. The greatest return on formal methods may be obtained when relatively few, very highly skilled people apply formal methods to the hardest and most critical problems. [17] Whereas two state of the art general purpose verification environments such as PVS and ACL2 have different strengths and weaknesses, we believe that either can be an effective and powerful tool in the hands of a skilled user. Both have been used for some very sophisticated specification and proof ....

J. Rushby. Formal methods and their role in digital systems validation for airborne systems. Contractor Report 4673, NASA, August 1995.

....RATIONALE To begin to answer this question, let us consider a typical rationale for formal methods. The rationale given here is based on the arguments given previously by NASA Langley formal methods team members (myself included) 8] augmented by arguments from other Langley sponsored work [9, 10]. Software is notorious for being late in delivery and unpredictable and unreliable in operation. According to a 1994 article by Wayt Gibbs, Studies have shown that for every six new large scale software systems that are put into operation, two others are cancelled. The average software ....

....As a result, I presented a simple revised rationale, which I believe shows conclusively why engineers should consider formal methods. The ideas in this revised rationale are not original. Rushby includes the basic concepts, although his other detailed discussions tend to distract from them [9, 10]; and Parnas states them succinctly [20] The contribution of this paper is in presenting the ideas in the context of an analysis of other approaches, and in a forum likely to be populated by engineers. I believe that engineers will consider formal methods, and that, as one industry engineer says, ....

John Rushby. Formal Methods and Their Role in Digital Systems Validation for Airborne Systems. NASA Contractor Report 4673, August 1995.

....effectively reuse the artifacts of their earlier verifications. Under FAA sponsorship through the Langley program, Rushby of SRI wrote an extended report on the application of formal methods to validation of digital systems [51] This huge document was condensed into a chapter on formal methods [54] for the FAA Digital Systems Validation Handbook[16] Also, in 1992, a team was formed to study applications and transfer of formal methods into NASA space programs. The team consists of researchers and practitioners from Langley, Johnson Space Center, the Jet Propulsion Lab, Loral Space ....

John Rushby. Formal methods and their role in digital systems validation for airborne systems. NASA Contractor Report 4673, August 1995.

....from SRI. Our work was performed in the context of a broad program of applied formal methods activity at NASA s Langley Research Center (LaRC) 2] Additional background and overview material on the use of formal methods in aerospace applications can be found in Rushby s formal methods handbooks [16,17], and in the previously mentioned guidebook volumes [12,13] 2 Overview of SAFER SAFER is a small, self contained, backpack propulsion system enabling free flying mobility for a crew member engaged in extravehicular activity (EVA) SAFER is a single string system designed for contingency use only. ....

John Rushby. Formal methods and their role in digital systems validation for airborne systems. NASA Contractor Report 4673, August 1995.

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J.M. Rushby. Formal methods and their role in digital systems validation for airborne systems. Technical report, SRI International, Menlo Park, California, CSL-95-01, March 1995.

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