![](media/image1.png){width="1.125in"
height="1.0118055555555556in"}Requirements Peer Review

Checklist

**Number:** 580-CK-057-01 **Approved By: (signature)**

**Effective Date:** April 24, 2006 **Name:** Barbara Pfarr

**Expiration Date:** April 24, 2011 **Title:** Assoc. Chief, ISD

**Responsible Office:** 580/Information Systems Division (ISD) **Asset
Type:** Checklist

######### Title: Requirements Peer Review Checklist PAL Number: 2.2.1.5

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| n |   |                                   |   |   |   |                     |
| c |   |                                   |   |   |   |                     |
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| a |   |                                   |   |   |   |                     |
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| g |   |                                   |   |   |   |                     |
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|   |   |                                   |   |   |   |                     |
| F |   |                                   |   |   |   |                     |
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| k |   |                                   |   |   |   |                     |
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| ) |   |                                   |   |   |   |                     |
| i |   |                                   |   |   |   |                     |
| n |   |                                   |   |   |   |                     |
| t |   |                                   |   |   |   |                     |
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| k |   |                                   |   |   |   |                     |
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| t |   |                                   |   |   |   |                     |
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| n |   |                                   |   |   |   |                     |
| y |   |                                   |   |   |   |                     |
| p |   |                                   |   |   |   |                     |
| r |   |                                   |   |   |   |                     |
| o |   |                                   |   |   |   |                     |
| b |   |                                   |   |   |   |                     |
| l |   |                                   |   |   |   |                     |
| e |   |                                   |   |   |   |                     |
| m |   |                                   |   |   |   |                     |
| a |   |                                   |   |   |   |                     |
| r |   |                                   |   |   |   |                     |
| e |   |                                   |   |   |   |                     |
| a |   |                                   |   |   |   |                     |
| s |   |                                   |   |   |   |                     |
| o |   |                                   |   |   |   |                     |
| r |   |                                   |   |   |   |                     |
| e |   |                                   |   |   |   |                     |
| x |   |                                   |   |   |   |                     |
| c |   |                                   |   |   |   |                     |
| e |   |                                   |   |   |   |                     |
| p |   |                                   |   |   |   |                     |
| t |   |                                   |   |   |   |                     |
| i |   |                                   |   |   |   |                     |
| o |   |                                   |   |   |   |                     |
| n |   |                                   |   |   |   |                     |
| s |   |                                   |   |   |   |                     |
| u |   |                                   |   |   |   |                     |
| n |   |                                   |   |   |   |                     |
| d |   |                                   |   |   |   |                     |
| e |   |                                   |   |   |   |                     |
| r |   |                                   |   |   |   |                     |
| " |   |                                   |   |   |   |                     |
| I |   |                                   |   |   |   |                     |
| s |   |                                   |   |   |   |                     |
| s |   |                                   |   |   |   |                     |
| u |   |                                   |   |   |   |                     |
| e |   |                                   |   |   |   |                     |
| s |   |                                   |   |   |   |                     |
| a |   |                                   |   |   |   |                     |
| n |   |                                   |   |   |   |                     |
| d |   |                                   |   |   |   |                     |
| C |   |                                   |   |   |   |                     |
| o |   |                                   |   |   |   |                     |
| m |   |                                   |   |   |   |                     |
| m |   |                                   |   |   |   |                     |
| e |   |                                   |   |   |   |                     |
| n |   |                                   |   |   |   |                     |
| t |   |                                   |   |   |   |                     |
| s |   |                                   |   |   |   |                     |
| . |   |                                   |   |   |   |                     |
| " |   |                                   |   |   |   |                     |
+---+---+-----------------------------------+---+---+---+---------------------+
|   |   |                                   |   |   | I |                     |
|   |   |                                   |   |   | s |                     |
|   |   |                                   |   |   | s |                     |
|   |   |                                   |   |   | u |                     |
|   |   |                                   |   |   | e |                     |
|   |   |                                   |   |   | s |                     |
|   |   |                                   |   |   | a |                     |
|   |   |                                   |   |   | n |                     |
|   |   |                                   |   |   | d |                     |
|   |   |                                   |   |   | C |                     |
|   |   |                                   |   |   | o |                     |
|   |   |                                   |   |   | m |                     |
|   |   |                                   |   |   | m |                     |
|   |   |                                   |   |   | e |                     |
|   |   |                                   |   |   | n |                     |
|   |   |                                   |   |   | t |                     |
|   |   |                                   |   |   | s |                     |
+---+---+-----------------------------------+---+---+---+---------------------+
| 1 |   | **Compliance with standards** --  |   |   |   |                     |
|   |   | Does the requirements             |   |   |   |                     |
|   |   | specification comply with ISD or  |   |   |   |                     |
|   |   | tailored Branch/project-level     |   |   |   |                     |
|   |   | standards and naming conventions? |   |   |   |                     |
|   |   |                                   |   |   |   |                     |
|   |   | *GUIDANCE: If, for example,       |   |   |   |                     |
|   |   | applicable standards specify that |   |   |   |                     |
|   |   | certain material should be        |   |   |   |                     |
|   |   | included in the requirements      |   |   |   |                     |
|   |   | specification, and this material  |   |   |   |                     |
|   |   | is missing, without any           |   |   |   |                     |
|   |   | explanation, then this should be  |   |   |   |                     |
|   |   | noted under "Issues and           |   |   |   |                     |
|   |   | Comments."*                       |   |   |   |                     |
|   |   |                                   |   |   |   |                     |
|   |   | *GUIDANCE: If any waivers to      |   |   |   |                     |
|   |   | applicable standards have been    |   |   |   |                     |
|   |   | granted, make a notation to this  |   |   |   |                     |
|   |   | effect under "Issues and          |   |   |   |                     |
|   |   | Comments." Approved ISD standards |   |   |   |                     |
|   |   | may be found on the EPG web site  |   |   |   |                     |
|   |   | at                                |   |   |   |                     |
|   |   | <http://soft                      |   |   |   |                     |
|   |   | ware.gsfc.nasa.gov/process.cfm>.* |   |   |   |                     |
+---+---+-----------------------------------+---+---+---+---------------------+
| 2 |   | **Completeness of                 |   |   |   |                     |
|   |   | Specifications** -- Does the      |   |   |   |                     |
|   |   | requirements specification        |   |   |   |                     |
|   |   | document address all known        |   |   |   |                     |
|   |   | requirements? Have 'TBD'          |   |   |   |                     |
|   |   | requirements been kept to a       |   |   |   |                     |
|   |   | minimum, or eliminated entirely?  |   |   |   |                     |
|   |   |                                   |   |   |   |                     |
|   |   | *GUIDANCE: A requirements         |   |   |   |                     |
|   |   | specification should address such |   |   |   |                     |
|   |   | elements as control flow, data    |   |   |   |                     |
|   |   | transformations, design           |   |   |   |                     |
|   |   | constraints, and user interface.* |   |   |   |                     |
+---+---+-----------------------------------+---+---+---+---------------------+
| 3 |   | **Clarity** -- Are the            |   |   |   |                     |
|   |   | requirements clear enough to be   |   |   |   |                     |
|   |   | turned over to an independent     |   |   |   |                     |
|   |   | group for implementation?         |   |   |   |                     |
+---+---+-----------------------------------+---+---+---+---------------------+
| 4 |   | **Consistency** -- Are the        |   |   |   |                     |
|   |   | specifications consistent in      |   |   |   |                     |
|   |   | notation, terminology, and level  |   |   |   |                     |
|   |   | of functionality? Are any         |   |   |   |                     |
|   |   | required algorithms mutually      |   |   |   |                     |
|   |   | compatible?                       |   |   |   |                     |
+---+---+-----------------------------------+---+---+---+---------------------+
| 5 |   | **External Interfaces** -- Have   |   |   |   |                     |
|   |   | external interfaces been          |   |   |   |                     |
|   |   | adequately defined?               |   |   |   |                     |
|   |   |                                   |   |   |   |                     |
|   |   | *GUIDANCE: Interface requirements |   |   |   |                     |
|   |   | are frequently documented in a    |   |   |   |                     |
|   |   | separate Interface Requirements   |   |   |   |                     |
|   |   | Document (IRD) or Interface       |   |   |   |                     |
|   |   | Control Document (ICD).*          |   |   |   |                     |
+---+---+-----------------------------------+---+---+---+---------------------+
| 6 |   | **Testability** -- Are the        |   |   |   |                     |
|   |   | requirements testable? Will the   |   |   |   |                     |
|   |   | testers be able to determine      |   |   |   |                     |
|   |   | whether each requirement has been |   |   |   |                     |
|   |   | satisfied?                        |   |   |   |                     |
|   |   |                                   |   |   |   |                     |
|   |   | *GUIDANCE: The requirements       |   |   |   |                     |
|   |   | specification should state how    |   |   |   |                     |
|   |   | every requirement will be tested. |   |   |   |                     |
|   |   | This helps to reduce ambiguity,   |   |   |   |                     |
|   |   | increase clarity, and show        |   |   |   |                     |
|   |   | testability.*                     |   |   |   |                     |
+---+---+-----------------------------------+---+---+---+---------------------+
| 7 |   | **Design-Neutrality** -- Does the |   |   |   |                     |
|   |   | requirements specification state  |   |   |   |                     |
|   |   | what actions are to be performed, |   |   |   |                     |
|   |   | rather than how these actions     |   |   |   |                     |
|   |   | will be performed?                |   |   |   |                     |
|   |   |                                   |   |   |   |                     |
|   |   | *GUIDANCE: In other words, the    |   |   |   |                     |
|   |   | requirements should concentrate   |   |   |   |                     |
|   |   | on what the software needs to do, |   |   |   |                     |
|   |   | rather than how it will do it.*   |   |   |   |                     |
|   |   |                                   |   |   |   |                     |
|   |   | *GUIDANCE: In the case where a    |   |   |   |                     |
|   |   | system or subsystem is being      |   |   |   |                     |
|   |   | configured from a product line,   |   |   |   |                     |
|   |   | design neutrality does not apply. |   |   |   |                     |
|   |   | Instead, one should show that     |   |   |   |                     |
|   |   | requirements are consistent with  |   |   |   |                     |
|   |   | the selected product line         |   |   |   |                     |
|   |   | architecture.*                    |   |   |   |                     |
+---+---+-----------------------------------+---+---+---+---------------------+
| 8 |   | **Readability** -- Does the       |   |   |   |                     |
|   |   | requirements specification use    |   |   |   |                     |
|   |   | the language of the intended      |   |   |   |                     |
|   |   | testers and users of the system,  |   |   |   |                     |
|   |   | not software jargon?              |   |   |   |                     |
+---+---+-----------------------------------+---+---+---+---------------------+
| 9 |   | **Level of Detail** -- Are the    |   |   |   |                     |
|   |   | requirements at a fairly          |   |   |   |                     |
|   |   | consistent level of detail?       |   |   |   |                     |
|   |   | Should any particular requirement |   |   |   |                     |
|   |   | be specified in more detail? In   |   |   |   |                     |
|   |   | less detail?                      |   |   |   |                     |
|   |   |                                   |   |   |   |                     |
|   |   | *GUIDANCE: At GSFC, there are at  |   |   |   |                     |
|   |   | least three levels of             |   |   |   |                     |
|   |   | requirements. Level 1 is for      |   |   |   |                     |
|   |   | Mission-level or Project-level    |   |   |   |                     |
|   |   | requirements, Level 2 for         |   |   |   |                     |
|   |   | requirements at the software      |   |   |   |                     |
|   |   | system level, and Level 3 for     |   |   |   |                     |
|   |   | subsystem-level requirements.     |   |   |   |                     |
|   |   | Frequently there is also a Level  |   |   |   |                     |
|   |   | 4, which contains internal, or    |   |   |   |                     |
|   |   | all-software, requirements. There |   |   |   |                     |
|   |   | is normally a separate            |   |   |   |                     |
|   |   | requirements specification for    |   |   |   |                     |
|   |   | each level of requirements. It is |   |   |   |                     |
|   |   | important that each requirement   |   |   |   |                     |
|   |   | be stated at an appropriate level |   |   |   |                     |
|   |   | of detail, and that all the       |   |   |   |                     |
|   |   | requirements in a given           |   |   |   |                     |
|   |   | requirements specification be at  |   |   |   |                     |
|   |   | the same level of detail.*        |   |   |   |                     |
+---+---+-----------------------------------+---+---+---+---------------------+
| 1 |   | **Requirements Singularity** --   |   |   |   |                     |
| 0 |   | Does each requirement address a   |   |   |   |                     |
|   |   | single concept, topic, element,   |   |   |   |                     |
|   |   | or value?                         |   |   |   |                     |
|   |   |                                   |   |   |   |                     |
|   |   | *GUIDANCE: Avoid compound         |   |   |   |                     |
|   |   | requirements that do not clearly  |   |   |   |                     |
|   |   | delineate the parts with separate |   |   |   |                     |
|   |   | identifiers.*                     |   |   |   |                     |
+---+---+-----------------------------------+---+---+---+---------------------+
| 1 |   | **Definition of Inputs and        |   |   |   |                     |
| 1 |   | Outputs** -- Have the internal    |   |   |   |                     |
|   |   | interfaces, i.e., the required    |   |   |   |                     |
|   |   | inputs to and outputs from the    |   |   |   |                     |
|   |   | software system, been fully       |   |   |   |                     |
|   |   | defined? Have the required data   |   |   |   |                     |
|   |   | transformations been adequately   |   |   |   |                     |
|   |   | specified?                        |   |   |   |                     |
|   |   |                                   |   |   |   |                     |
|   |   | *GUIDANCE: Note that use of       |   |   |   |                     |
|   |   | correct units is a commonly       |   |   |   |                     |
|   |   | occurring issue for data          |   |   |   |                     |
|   |   | interfaces and transformations.*  |   |   |   |                     |
+---+---+-----------------------------------+---+---+---+---------------------+
| 1 |   | **Scope** -- Does the             |   |   |   |                     |
| 2 |   | requirements specification        |   |   |   |                     |
|   |   | adequately define boundaries for  |   |   |   |                     |
|   |   | the scope of the target software  |   |   |   |                     |
|   |   | system? Are any essential         |   |   |   |                     |
|   |   | requirements missing?             |   |   |   |                     |
+---+---+-----------------------------------+---+---+---+---------------------+
| 1 |   | **Design Constraints** -- Are all |   |   |   |                     |
| 3 |   | stated design and performance     |   |   |   |                     |
|   |   | constraints realistic and         |   |   |   |                     |
|   |   | justifiable?                      |   |   |   |                     |
|   |   |                                   |   |   |   |                     |
|   |   | *GUIDANCE: An example of an       |   |   |   |                     |
|   |   | unrealistic constraint might be   |   |   |   |                     |
|   |   | 100% availability of the system,  |   |   |   |                     |
|   |   | or 1 nanosecond response to the   |   |   |   |                     |
|   |   | user. Actually, a 1 nanosecond    |   |   |   |                     |
|   |   | response time might seem          |   |   |   |                     |
|   |   | unrealistic, but could also be    |   |   |   |                     |
|   |   | necessary.*                       |   |   |   |                     |
+---+---+-----------------------------------+---+---+---+---------------------+
| 1 |   | **Traceability** -- Has a         |   |   |   |                     |
| 4 |   | bidirectional traceability matrix |   |   |   |                     |
|   |   | been provided?                    |   |   |   |                     |
+---+---+-----------------------------------+---+---+---+---------------------+
| * |   |                                   |   |   |   |                     |
| * |   |                                   |   |   |   |                     |
| N |   |                                   |   |   |   |                     |
| o |   |                                   |   |   |   |                     |
| t |   |                                   |   |   |   |                     |
| e |   |                                   |   |   |   |                     |
| s |   |                                   |   |   |   |                     |
| / |   |                                   |   |   |   |                     |
| A |   |                                   |   |   |   |                     |
| c |   |                                   |   |   |   |                     |
| t |   |                                   |   |   |   |                     |
| i |   |                                   |   |   |   |                     |
| o |   |                                   |   |   |   |                     |
| n |   |                                   |   |   |   |                     |
| I |   |                                   |   |   |   |                     |
| t |   |                                   |   |   |   |                     |
| e |   |                                   |   |   |   |                     |
| m |   |                                   |   |   |   |                     |
| s |   |                                   |   |   |   |                     |
| f |   |                                   |   |   |   |                     |
| o |   |                                   |   |   |   |                     |
| r |   |                                   |   |   |   |                     |
| f |   |                                   |   |   |   |                     |
| o |   |                                   |   |   |   |                     |
| l |   |                                   |   |   |   |                     |
| l |   |                                   |   |   |   |                     |
| o |   |                                   |   |   |   |                     |
| w |   |                                   |   |   |   |                     |
| - |   |                                   |   |   |   |                     |
| u |   |                                   |   |   |   |                     |
| p |   |                                   |   |   |   |                     |
| * |   |                                   |   |   |   |                     |
| * |   |                                   |   |   |   |                     |
+---+---+-----------------------------------+---+---+---+---------------------+
| \ | A |                                   | A |   |   | Due Date            |
| # | c |                                   | s |   |   |                     |
|   | t |                                   | s |   |   |                     |
|   | i |                                   | i |   |   |                     |
|   | o |                                   | g |   |   |                     |
|   | n |                                   | n |   |   |                     |
|   |   |                                   | e |   |   |                     |
|   |   |                                   | e |   |   |                     |
+---+---+-----------------------------------+---+---+---+---------------------+
|   |   |                                   |   |   |   |                     |
+---+---+-----------------------------------+---+---+---+---------------------+
|   |   |                                   |   |   |   |                     |
+---+---+-----------------------------------+---+---+---+---------------------+
|   |   |                                   |   |   |   |                     |
+---+---+-----------------------------------+---+---+---+---------------------+
|   |   |                                   |   |   |   |                     |
+---+---+-----------------------------------+---+---+---+---------------------+
|   |   |                                   |   |   |   |                     |
+---+---+-----------------------------------+---+---+---+---------------------+

+----------+-----------------------------------------------------------+
| **Refe   | -   **Glossary:**                                         |
| rences** |     <http://software.gsfc.nasa.gov/glossary.cfm>. Defines |
|          |     common terms used in ISD process assets               |
|          |                                                           |
|          | -   **Process Asset Library:**                            |
|          |     <http://software/gsfc.nasa.gov/process.cfm> Library   |
|          |     of all ISD process descriptions                       |
|          |                                                           |
|          | -   Adaptable Process Model, System Level Requirements    |
|          |     Validation, R. S. Pressman and Associates:            |
|          |     [h                                                    |
|          | ttp://www.rspa.com/checklists/sysreqval.html]{.underline} |
|          |                                                           |
|          | -   Adaptable Process Model, Software Requirements        |
|          |     Specification, R. S. Pressman and Associates:         |
|          |                                                           |
|          | [http://www.rspa.com/checklists/reqspec.html]{.underline} |
|          |                                                           |
|          | -   Software Formal Inspections Guidebook, NASA-GB-A302,  |
|          |     August 1993, Appendix A, Checklist SY, Functional     |
|          |     Requirements Checklist (JPL), pp. 65-66:              |
|          |     <http://satc.gsfc.nasa.gov/Documents/fi/gdb/fi.pdf>   |
|          |                                                           |
|          | -   Recommended Approach to Software Development,         |
|          |     Revision 3, SEL-81-305, Goddard Space Flight Center,  |
|          |     June 1992.                                            |
|          |                                                           |
|          | -   SSDM Standards and Procedures, Computer Sciences      |
|          |     Corporation, 1993.                                    |
+----------+-----------------------------------------------------------+

+------------+------+------+------------------------------------------+
| **Change   | ##   | ###  | **Description of Improvements**          |
| History**  | #### | ###  |                                          |
|            |  Ver | Date |                                          |
|            | sion |      |                                          |
+------------+------+------+------------------------------------------+
|            | 1.0  | 4/2  | Initial approved version by CCB          |
|            |      | 4/06 |                                          |
+------------+------+------+------------------------------------------+
|            | ###  | ###  |                                          |
|            | ###  | ###  |                                          |
+------------+------+------+------------------------------------------+