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ISO-21448-2019 Scope Normative references. 3 Terms and definitions. 4 Overview of this document’s activities in the development process.. 5 Functional and system specification (intended functionality content). 5.1 Objectives. 5.2 Functional description. 5.3 Consideration on system design and architecture.. 6 Identification and Evaluation of hazards caused by the intended functionality. 6.1 Objectives... 6.2 Hazard identification... 6.3 Hazard analysis...
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ISO/TC 22/SC 32/WG 8 N 701
REPLACES: ISO/TC 22/SC 32/WG 8 N 700
ISO/TC 22/SC 32/WG 8
Functional safety
E-mail of Secretary: fritzsche@vda.de
Secretariat: DIN
700 ISO WD21448 RC2
Date of document 2019-05-20
Expected action Comment
Due Date 2019-08-08
Background
Working Draft for circulation and national commenting
Members of SC32/WG8 are kindly requested to study and comment the attached draft. Please use only the
commenting formsheet as provided in Folder "Public Information" of this committee and will in all columns in a
correct way, except the last column.
Only 1 Comment Sheet per P-Member country shall be send to the PL nicolas.becker@mpsa.com and to the
secretatiat fritzsche@vda.de by E-Mail as WordFile (.docx) before the above mentined deadline as agreed at
our last meeting.
Remarks for using Commenting formsheet:
- all collumns 1 to 7 need to be filled in
- tabels neet be be inserted as "bitmap" in a cell not as table
- Column 8 need to be totally empty
- no information after the table, those additional information need to be stored in the relevant cell as a "linked
file"
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ISO/WD 21448 :2019
Version date 2019-05-17; please reply before 2019-08-17
ISO TC 22/SC 32/WG 8
Secretariat:DIN
Roadvehicles— SafetyoftheIntendedFunctionality
WorkingDraft
WarningforWDsandCDs
ThisdocumentisnotanISOInternationalStandard.Itisdistributedforreviewandcomment.Itissubject to
changewithoutnoticeandmaynotbereferredtoasanInternationalStandard.
Recipientsofthisdraftareinvitedtosubmit,withtheircomments,notificationofanyrelevantpatentrightsof
whichtheyareawareandtoprovidesupportingdocumentation.
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©ISO 2017 – Allrightsreserved 2
©ISO2018
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or
utilizedotherwiseinanyformorbyanymeans,electronicormechanical,includingphotocopying,or
postingontheinternetoranintranet,withoutpriorwrittenpermission.Permissioncanberequested
fromeitherISOattheaddressbeloworISO'smemberbodyinthecountryoftherequester.
ISOcopyrightoffice
Casepostale 56 CH-1211Geneva20
Tel. +41227490111
Fax +41227490947
E-mail copyright@iso.org
Web www.iso.org
PublishedinSwitzerland.
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©ISO 2017 – Allrightsreserved 3
Contents
Foreword ..................................................................................................................................................................1
Introduction.............................................................................................................................................................2
1 Scope ............................................................................................................................................................3
2 Normativereferences..............................................................................................................................4
3 Termsanddefinitions .............................................................................................................................4
4 Overviewandorganizationofactivitiesinthedevelopmentprocess .....................................11
4.1 Overviewofactivitiesinthedevelopmentprocess.................................................................................... 11
4.2 DistributedSOTIFdevelopmentactivities....................................................................................................... 19
5 Function,systemspecificationanddesign(intendedfunctionalitycontent)........................20
5.1 Objectives.......................................................................................................................................................................... 20
5.2 Functionaldescription............................................................................................................................................... 20
5.3 Considerationonsystemdesignandarchitecture...................................................................................... 21
5.4 WorkProducts ............................................................................................................................................................... 23
6 IdentificationandEvaluationofhazardscausedbytheintendedfunctionality ..................23
6.1 Objectives.......................................................................................................................................................................... 23
6.2 Hazardidentification.................................................................................................................................................. 23
6.3 Hazardanalysis.............................................................................................................................................................. 25
6.4 Riskevaluationoftheintendedfunction ......................................................................................................... 25
6.5 Analysisofreasonablyforeseeablemisuse..................................................................................................... 25
6.6 Specificationofavalidationtarget...................................................................................................................... 26
6.7 WorkProducts ............................................................................................................................................................... 27
7 Identification and evaluation of performance limitations and potential triggering
conditions...............................................................................................................................................................27
7.1 Objectives.......................................................................................................................................................................... 27
7.2 Inputstothisclause..................................................................................................................................................... 27
7.3 Analysisoftriggeringconditions.......................................................................................................................... 28
7.4 Acceptabilityoftheresponseofthesystemtothetriggeringconditions....................................... 32
7.5 WorkProducts ............................................................................................................................................................... 33
8 FunctionalmodificationstoreduceSOTIFrelatedrisks .............................................................33
8.1 Objectives.......................................................................................................................................................................... 33
8.2 General ............................................................................................................................................................................... 33
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©ISO 2017 – Allrightsreserved 4
8.3 MeasurestoimprovetheSOTIF............................................................................................................................ 34
8.4 Updatingthesystemspecification....................................................................................................................... 36
8.5 WorkProducts ............................................................................................................................................................... 36
9 Definitionoftheverificationandvalidationstrategy ..................................................................37
9.1 Objectives.......................................................................................................................................................................... 37
9.2 Planningandspecificationofintegrationandtesting............................................................................... 38
9.3 Workproducts ............................................................................................................................................................... 39
10 Evaluateknownhazardousscenarios(Area2)..............................................................................39
10.1 Objectives.......................................................................................................................................................................... 39
10.2 Sensorverification....................................................................................................................................................... 40
10.3 Decisionalgorithmverification............................................................................................................................. 40
10.4 Actuationverification................................................................................................................................................. 41
10.5 Integratedsystemverification............................................................................................................................... 41
10.6 Workproducts ............................................................................................................................................................... 42
11 Evaluateunknownhazardousscenarios(Area3).........................................................................42
11.1 Objectives.......................................................................................................................................................................... 42
11.2 Evaluationofresidualrisk....................................................................................................................................... 43
11.3 Validationtestparameters ...................................................................................................................................... 43
11.4 Workproducts ............................................................................................................................................................... 44
12 MethodologyandcriteriaforSOTIFrelease ...................................................................................44
12.1 Objectives.......................................................................................................................................................................... 44
12.2 MethodologyforevaluatingSOTIFforrelease.............................................................................................. 44
12.3 CriteriaforSOTIFevaluation.................................................................................................................................. 45
Annex A(informative)GeneralguidanceonSOTIF....................................................................................47
A.1 ExamplesofstructuringtheSOTIFargumentationwithGSN............................................................... 47
A.2 ExampleofinteractionbetweenISO26262andISO21448.................................................................. 57
A.3 ExamplesoftheapplicationofSOTIFactivities............................................................................................ 66
Annex B(informative)GuidanceonScenarioandsystemanalyses .....................................................73
B.1 MethodforderivingSOTIFmisusescenarios................................................................................................ 73
B.2 ExampleconstructionofscenarioforSOTIFsafetyanalysismethod ............................................... 76
B.3 IntroductiontotheSORAmethod........................................................................................................................ 79
B.4 Examplesofadaptationofsafetyanalysestoidentifyandevaluatethepotentialtriggering
conditionsandperformancelimitations................................................................................................................................ 83
Annex C(informative)GuidanceonSOTIFverificationandvalidation ...............................................94
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