SWE-106 - Software Assurance Plan
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18.104.22.168 The Software Assurance Plan(s) shall be developed and documented per NASA-STD-8739.8, NASA Software Assurance Standard.
NPR 7150.2A does not include any notes for this requirement.
Implementation Notes from Appendix D
NPR 7150.2A does not include any implementation notes for this requirement.
Applicability Across Classes
This requirement applies to all classes and safety criticalities except:
- Class D and not Safety Critical
- Class E and not Safety Critical
- Class H
Software assurance activities ensure that the project team implements software engineering products and processes according to the plans established by the project and comply with requirements in the NASA Software Assurance Standard. The NASA Software Assurance Standard captures the assurance requirements in a single place for more uniform application across projects where software is developed or acquired for NASA.
The Software Assurance Plan represents an agreement between the project, the software developers and the software assurance personnel. It describes the activities, roles, and responsibilities of software assurance on the project. As with any task, a plan helps ensure that the team performs all necessary and required tasks. Development of that plan provides the opportunity for stakeholders to give input and assist with the documentation and tailoring of the planned activities for the project.
Specific to software assurance, the NASA Software Assurance Standard provides requirements that the team can use as the basis for development of a project's software assurance plan. Using this previously thought-out, defined set of requirements gives plan development teams a common starting point for their activities and ensures that all software assurance plans include and address the same key tasks and assurance activities.
Per NPR 7150.2A, "The Software Assurance Plan details the procedures, reviews, and audits required to accomplish software assurance. The project office should coordinate with the Office of Safety and Mission Assurance for help in scoping and adapting the effort appropriately, and to designate the individual responsible for software assurance on the project."
For projects that involve subcontracted work, both the acquirer and the provider (subcontractor), need Software Assurance Plans and those plans must work together to accomplish the required level of software assurance. The preliminary acquirer plan is developed at the same time the Request for Proposal (RFP) or Memorandum of Agreement/Understanding (MOA/U) is created. Both acquirer and provider plans are to be completed by the time the contract is awarded.
As with many project plans, the Software Assurance Plan (SAP) may be a separate document or may be combined with another project plan such as the Software Development Plan (SDP).
While the NASA Software Assurance Standard contains requirements for software assurance in general, the following requirements, identified by the paragraph numbers, apply specifically to the development and documentation of a SAP. These requirements, shown here without their associated project lifecycle phase, provide a high-level content overview of both the acquirer and provider SAPs. When carrying out these requirements, consult the NASA Software Assurance Standard to determine the specific lifecycle phase in which they are to be completed.
- 22.214.171.124 - Prepare a preliminary acquirer program/project software assurance plan documenting the planned level of software assurance effort and activities required and the necessary resources using the template provided in Appendix B [of the NASA Software Assurance Standard].
- 126.96.36.199 - Verify that the provider's software assurance plan meets contractual requirements.
- 188.8.131.52 - Verify that the acquirer's software assurance plan and the provider's software assurance plan are consistent, compatible, and are baselined.
- 6.3.1 - Each software provider shall establish and maintain a software assurance plan that addresses all software development and maintenance activities.
NOTE: For smaller projects, this plan may be incorporated in another project-planning document or may be a separate document. Larger projects may have a separate plan or more than one software assurance plan.
- 6.3.2 - The software assurance plan shall:
- 184.108.40.206 - Conform to IEEE 730-2002, IEEE Standard for Software Quality Assurance Plans.
- 220.127.116.11 - In addition, address how the provider will implement the requirements of Sections 6.0 and 7.0 of this Standard [NASA Software Assurance Standard].
- 18.104.22.168 - If there is any conflict between Section 6.0 or Section 7.0 of this Standard and IEEE 730-2002, IEEE Standard for Software Quality Assurance Plans, this Standard shall take precedence.
The NASA Software Safety Standard (NASA-STD-8719.13B) also includes two requirements that address content to consider for the SAP:
- 22.214.171.124 - The analysis methodology [TOOL:for software design] shall be recorded in an appropriate document (e.g., software safety plan or software assurance plan).
- 126.96.36.199 - The analysis methodology [TOOL:for software implementation, e.g., code] shall be recorded in an appropriate document (e.g., software safety plan or software assurance plan).
Before writing a SAP, the team should review the following material as preparation:
- Software assurance lessons learned from similar projects
- Existing software assurance processes, standards, procedures, etc.
- Software assurance deliverables (records, reports, etc.) for similar projects
Using an existing template will ensure consistency of plans across projects as well as ensure all key information is included in the SAP. If a project or Center SAP template or "best-in-class" example does not exist, the NASA Software Assurance Standard (NASA-STD-8739.8) contains a basic outline in Appendix B. Templates are included in the Resources section of this guidance, including one from Goddard Space Flight Center (GSFC) based on the IEEE 730-2002 standard noted in the NASA Software Assurance Standard requirements which includes suggested content for each section of the SAP.
Other content elements to consider include:
- Software assurance organization and management structure and responsibilities
- Software assurance planning activities
- Software assurance implementation activities covering all 5 assurance disciplines:
- Software Quality
- Software Safety
- Software Reliability
- Software Verification and Validation
- Independent Verification and Validation
- Standards and processes to be used, including those used for:
- Software assurance implementation activities such as reviews, audits, etc.
- Problem reporting and tracking
- Risk management
- Software assurance metrics (e.g., planned vs. actual reviews, audits, assessments; open vs. closed issues; number of identified risks; etc.)
- Record creation, review, and maintenance
- Training for software assurance personnel
- Resources, including tools, personnel, and facilities
- Identification of products and processes to be reviewed or audited
- Identification of deliverables (records) to be created and maintained
Ensure that the SAP is reviewed prior to implementation and at appropriate lifecycle reviews by personnel with sufficient software assurance knowledge to identify omissions, inadequacies, and other issues. Stakeholders affected by the plan should also be included in the reviews for awareness of planned activities and so that their suggestions can be addressed within the bounds of the project's required level of software assurance. Any identified issues should be corrected prior to plan implementation or prior to carrying out affected software assurance activities in the next lifecycle phase.
The following diagram excerpted from the Glenn Research Center SQA Process for Software Assurance, SEGP-SQA-PRC-15, shows a basic flow of activities for developing and documenting a SAP:
Any changes to the baselined SAP (typically baselined at PDR) should be made via the appropriate formal change request process (internal to the project for the acquirer SAP or via NASA's formal change request process for the provider SAP) and be accompanied by a risk analysis to ensure the project's level of software assurance is not compromised.
Guidance related to software assurance and which should be included in the SAP may be found in the following requirement in this handbook:
Software Assurance Plan
Independent Software Classification Assessment
Software Safety Determination
According to the NASA Software Assurance Standard, smaller projects have the choice of incorporating their SAP in another project planning document or using a separate document.
If personnel resources are limited, the SAP may address the overall strategy, planning, and requirements at a high level for review at the Software Requirements Review (SRR), with updates to address details of the assurance activities added, as necessary, during project development.
Small projects may want to tailor an existing software assurance plan specifically written for small projects. Tailoring a proven plan from a similar project should reduce the overall plan development effort.
- NPR 7150.2A Handbook, Section 5.3.1 - NASA-STD-8739.8 (Standard for Software Assurance)
- NASA Software Assurance Standard, NASA-STD-8739.8
- ISD Software Quality and IV&V Support Planning Guidelines, 580-GL-030-01, Goddard Space Flight Center (GSFC)
- Dryden Centerwide Procedure, Code S, Software Assurance, DCP-S-007 Rev. B., Dryden Flight Research Center (DFRC)
- SQA Process, Software Assurance, SEGP-SQA-PRC-1, Glenn Research Center (GRC), NEN Link
- Glenn Procedural Requirements, Software Assurance, GLPR 8739.1, GRC
- Software Process, Process and Product Quality Assurance, GRC-SW-7150.13, GRC
- IEEE 730-2002, IEEE Standard for Software Quality Assurance Plans(need user account to access IEEE standards via this NASA Technical Standards System link)
- Software Quality Assurance Plan template, GSFC
- Software Assurance Plan template, NEN Link
- Software Quality Assurance Plan Evaluation Checklist (from the Software Assurance Guidebook)
- Acquirer Software Assurance Plan template, NEN Link
There must be a software assurance plan. "Most Project Managers feel they have too many plans, and the suggestion of another one for Software Quality Assurance might be the proverbial straw that breaks the camel's back! But the success of any undertaking is to know what one is trying to achieve and how one expects to accomplish it, hence, the necessity of a plan for SQA. The plan will specify the goals, what is to be performed, standards against which the development work is to be measured, all relevant procedures, and the organizational structure of the Quality Assurance within the project. At NASA a software assurance plan is required." (Lesson 4 of 12, SoftwareTech News, https://softwaretechnews.thedacs.com/stn_view.php?stn_id=8&article_id=61)