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NASA SOFTWARE SAFETY GUIDEBOOK

PREFACE
Effective Date: 31 March 2004

This document has been issued to make available to software safety practitioners a guidebook
for assessing software systems for software’s contribution to safety and techniques for
analyzing and applying appropriate safety techniques and methods to software. Software
developers and software safety engineers are the primary focus; however, software assurance
(SA) engineers, project managers, system engineers, and system safety engineers will also
find this guidebook useful.

The document:

Provides an overview of general software safety and good software engineering
practices which contribute to software system safety.

Provides the means to scope and tailor the software safety and software engineering
activities to obtain the most cost effective, best quality, and safest products.

Provides analyses, methods and guidance which can be applied during each phase of
the software life cycle. Multiple checklists and examples are provided as well as
specific instructions for applying FMEA/CIL and FTA to software.

Includes development approaches, safety analyses, and testing methodologies that lead
to improved safety in the software product.

Procuring NASA Enterprise Programs or Centers shall review this document for applicability
to NASA contracts as well as for applicability to its internal activities.

Questions concerning the application of this publication to specific procurements or requests
should be referred to the NASA Enterprise Program or Center.

This guidebook cancels NASA-GB-l740.l3-96, NASA Guidebook for Safety Critical
Software Analysis and Development.