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BS EN IEC 60300-3-4:2022 – TC

BS EN IEC 60300-3-4:2022 – TC

$258.95

Tracked Changes. Dependability management – Application guide. Specification of dependability requirements

Published By Publication Date Number of Pages
BSI 2022 156
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PDF Catalog

PDF Pages PDF Title
1 30457145
95 A-30425062
96 undefined
100 Annex ZA (normative)Normative references to international publicationswith their corresponding European publications
101 English
CONTENTS
103 FOREWORD
105 INTRODUCTION
107 1 Scope
2 Normative references
3 Terms and definitions
109 4 Specifying dependability
4.1 Description of dependability specification
4.1.1 What is dependability?
110 4.1.2 What is a requirement?
4.1.3 What is assurance?
4.1.4 What is dependability specification?
4.1.5 Which attributes to specify?
111 4.1.6 Contracting for dependability
112 4.2 Principles
4.2.1 General
4.2.2 Systems approach
4.2.3 Requirements and goals
113 4.2.4 Assuring achievement of requirements
4.2.5 Cost implications
4.2.6 Dependability management
114 4.2.7 Expected useful life
4.3 Benefits
5 Derivation of dependability requirements
5.1 General
115 Figures
Figure 1 – High level process for derivation of dependabilityrequirements in the specification
116 5.2 Define stakeholder needs and expectations
117 5.3 Develop supporting documentation
Figure 2 – What are we trying to achieve?
118 5.4 Derive dependability requirements
5.4.1 General
119 5.4.2 Specification scenarios
121 5.4.3 Dependability attributes to be specified
Figure 3 – What do we need to manage?
Figure 4 – What constraints are there?
122 5.4.4 Providing evidence and assurance of dependability attributes
Figure 5 – Assurance considerations
124 5.4.5 Decide on the level of the requirements
5.4.6 Balance the results
5.4.7 Reliability requirements
126 5.4.8 Maintainability and maintenance requirements
Figure 6 – Reliability requirements
127 Figure 7 – Maintainability requirements
128 5.4.9 Supportability and support requirements
130 5.4.10 Availability requirements
Figure 8 – Supportability requirements
132 5.5 Justify the measures used for the dependability requirements
Figure 9 – Availability requirements
133 5.6 Complete dependability specification
5.7 Review dependability specification
134 Annex A (informative)Discussion on useful life
A.1 General
A.2 Factors that determine useful life
A.2.1 Useful life due to performance factors
135 A.2.2 Useful life due to obsolescence factors
A.2.3 Useful life due to economic factors
A.3 Specification of useful life of non-repairable items (components)
137 Annex B (informative)Process for prioritizing dependability attributes
Tables
Table B.1 – Questions for prioritizing dependability attributes
138 Figure B.1 – Process for prioritizing attributes
139 Annex C (informative)Development of a dependability specification for a home security system
C.1 Define stakeholder needs and expectations
C.2 Develop supporting documentation
C.2.1 Describe the system
C.2.2 Describe the system objectives
C.2.3 Identify the key functions to meet system objectives
C.2.4 Describe the functions
140 C.2.5 Identify the influencing factors affecting the functions
141 C.2.6 Evaluate the technical approach to achieve the needed functions
142 C.2.7 Describe the hardware, software, and human elements involved in the system operation
143 C.2.8 Determine the use profile of the system
C.2.9 Describe the modes of operation of the system
Figure C.1 – System configuration for normal mode of operation
Figure C.2 – System configuration for panic mode of operation
144 C.2.10 Maintenance and support requirements
C.3 Derive the dependability requirements
Figure C.3 – System configuration for security service mode of operation
145 C.4 Complete dependability specification
147 Annex D (informative)Influencing factors for dependability specification
D.1 Examples of constraints on system dependability
D.1.1 Economic constraints
D.1.2 Time constraints
D.1.3 Regulatory constraints
D.2 Type of system operation
148 D.3 Criticality of operation
D.3.1 General
D.3.2 Type of use
D.3.3 Type of users
149 D.3.4 Dependency of interacting systems
D.3.5 Structure or configuration of a system
150 D.3.6 Technical novelty
D.3.7 Novelty of operation
D.3.8 Legacy issues
151 D.3.9 Complexity
D.3.10 Number of systems in use
D.4 Determining relevant influencing factors for the evaluation of system functions
Table D.1 – Examples of influencing factors under each influencing condition
152 Table D.2 – Relationship of system properties with influencing conditions
153 Bibliography

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BS EN IEC 60300-3-4:2022 - TC
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