1.

Requirements

6.3.4

Centers

and

projects

shall

fully

comply

with

the

"shall"

statements

in

this

NPR

that

are

marked

with

an

"X"

in

Appendix

D

consistent

with

their

software

classification.

h2. {color:#003366}{*}

1.1

Notes

If the requirement is marked with a "SO"

in

appendix

D,

the

project

is

required

to

meet

the

requirement

to

the

extent

necessary

to

satisfy

the

safety

critical

aspects

of

the

software.

1.2

Applicability

Across

Classes

This

requirement

applies

to

all

classes

and

safety

criticalities.

{applicable:asc=1|ansc=1|bsc=1|bnsc=1|csc=1|cnsc=1|dsc=1|dnsc=1|esc=1|ensc=1|f=1|g=1|h=1} {div3}

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h1. 2. Rationale

Earlier versions of NPR 7150.2, NASA Software Engineering Requirements, assumed that readers would accept requirements marked by an "X" in Appendix D as required activities.  Experience with the baseline version of this NPR, i.e., NPR 7150.2, showed that this assumption was not universally confirmed.

{panel} NPR 7150.2 was written to include the explicit statement in the requirement that full compliance with the requirement is necessary for those entries assigned an "X" in Appendix D. {panel}

The purpose of the Requirements Mapping Matrix in NPR 7150.2 is to essentially pre-tailor out requirements for less critical software systems, e.g., while Class A software has 111 invoked requirements for projects, Class H has only 16.  The purpose of the "X" label is to clarify the intent of NPR 7150.2 and to preclude any alternate interpretation of invoked requirements.


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h1. 3. Guidance

This requirement affirms that designated Center and project personnel are to satisfy all invoked requirements of this NPR. The note further affirms that at least the safety aspects of an NPR requirement are to be satisfied if the requirement is simply labeled in NPR 7150.2, Appendix D, as "safety only" (SO).

This requirement makes a positive statement that the invoked requirement is to be fulfilled by the SWE's responsible party (indicated by the 4th column in the same Appendix D, Requirements Mapping Matrix).

{note} Inherently, it affirms that fulfillment of requirements marked with an "X" is the rule for specific NASA software classifications. {note}

Deviations, waivers, and tailoring of the requirements of NPR 7150.2 are to follow the approved processes for requirements management. (See [SWE-120|SWE-120] and [SWE-140|SWE-140].)
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h1. 4. Small Projects

No additional guidance is available for small projects. The community of practice is encouraged to submit guidance candidates for this paragraph.
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h1. 5. Resources

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