ISO 23135:2022

INTERNATIONAL ISO
STANDARD 23135
First edition
2022-03
Space systems — Verification
programme and management process
Reference number
© ISO 2022
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Published in Switzerland
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Contents Page
Foreword .v
Introduction . vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions and abbreviated terms . 1
3.1 Terms and definitions . 1
3.2 Abbreviated terms . 2
4 Requirements for space system verification management processes .3
4.1 General . 3
4.2 VM process 1: requirement flow-down and establishment of specification . 3
4.2.1 General . 3
4.2.2 Specification requirements and review . 4
4.2.3 Data supporting verification method and approach . 5
4.3 VM process 2: verification cross-reference matrix (VCRM) . 5
4.3.1 Cross-reference of specification requirements and verification method . 5
4.3.2 VCRM for the space system and lower level systems . 5
4.3.3 Verification by analysis . 5
4.3.4 Verification by test. 5
4.3.5 Verification by inspection and demonstration . 6
4.4 VM process 3: integration and test (I&T) process . 6
4.4.1 General . 6
4.4.2 Review of I&T plans for the space system and lower level systems . 6
4.4.3 Space system and lower-level I&T sequence and test environments . 6
4.4.4 Operational tests for space system . 6
4.4.5 Test readiness review (TRR) and entry/exit criteria . 6
4.4.6 Test discrepancy resolution and retest . 7
4.4.7 Test summary and “as tested” data review . 7
4.4.8 I&T plans for launch site operations for each element . 7
4.4.9 I&T plans for launch site operations for integrated system . 7
4.5 VM process 4: specification verification ledger (SVL) process . 7
4.5.1 General . 7
4.5.2 SVL content . 7
4.5.3 SVL documentation . 8
4.5.4 Subcontractor/vendor SVL plans for the space system element including
subsystems, and units . 8
4.6 VM process 5: acceptance and delivery review process. 8
4.6.1 General . 8
4.6.2 Space system and lower level systems acceptance and delivery review data
package . 8
4.6.3 Acceptance and delivery review plans for the systems developed by
subcontractors/vendors . 8
4.6.4 FCA and PCA summary as a part of acceptance package . 8
4.6.5 Acceptance/delivery review entry/exit criteria . 9
4.7 VM process 6: verification-related risk and issue/watch list management process . 9
4.7.1 General . 9
4.7.2 Status tracking of verification-related issue and concern items . 9
4.7.3 Reporting of verification-related issues to the programme risk
management board . 9
4.7.4 Verification-related risk and issue/watch list management plans for
the space system and lower level systems including those developed by
subcontractors/vendors . 9
5 Requirements for space systems verification programme management .9
iii
5.1 General . 9
5.2 Verification programme managed by each WBS element . 9
5.3 Integration of distributed verification programme . 10
5.4 Verification programme review . 10
5.5 Verification programme flow-down to subcontractors and vendors . 10
5.6 Verification activities coordinated with other review boards . 10
5.7 Validation of the verification process . 10
5.7.1 General . 10
5.7.2 DT&E and OT&E support . 10
5.7.3 Independent readiness review (IRR) and launch readiness review (LRR)
support . 10
5.8 Verification plan . 11
5.8.1 General . 11
5.8.2 Review of verification plans . 11
6 Use of verification management for late changes and heritage/commercial systems .11
6.1 General . 11
6.2 Late change verification management . 11
6.2.1 Verification of late changes utilizing VM processes 1 through 6 . 11
6.2.2 Late change categories .12
6.3 Heritage/commercial systems verification management .12
6.3.1 General .12
6.3.2 Heritage/commercial hardware and software applications .12
6.3.3 Verification of heritage hardware and software .13
Annex A (informative) Exemplar space system and an example of WBS-based verification
management structure .14
Annex B (informative) Review of verification plans for space system and lower system
level, including those developed by subcontractors/vendors .15
Annex C (informative) Deliverable/review documents associated with each verification
management rrocess .20
Annex D (informative) Contents of specification verification ledger (SVL) .22
Annex E (normative) Recommended Check List for Planning and Executing Late Changes,
Heritage, or Commercial System Applications .24
Bibliography .28
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Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the I
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