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BS EN IEC 60300-3-4:2022

BS EN IEC 60300-3-4:2022

$198.66

Dependability management – Application guide. Specification of dependability requirements

Published By Publication Date Number of Pages
BSI 2022 62
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PDF Pages PDF Title
2 undefined
6 Annex ZA (normative)Normative references to international publicationswith their corresponding European publications
7 English
CONTENTS
9 FOREWORD
11 INTRODUCTION
13 1 Scope
2 Normative references
3 Terms and definitions
15 4 Specifying dependability
4.1 Description of dependability specification
4.1.1 What is dependability?
16 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?
17 4.1.6 Contracting for dependability
18 4.2 Principles
4.2.1 General
4.2.2 Systems approach
4.2.3 Requirements and goals
19 4.2.4 Assuring achievement of requirements
4.2.5 Cost implications
4.2.6 Dependability management
20 4.2.7 Expected useful life
4.3 Benefits
5 Derivation of dependability requirements
5.1 General
21 Figures
Figure 1 – High level process for derivation of dependabilityrequirements in the specification
22 5.2 Define stakeholder needs and expectations
23 5.3 Develop supporting documentation
Figure 2 – What are we trying to achieve?
24 5.4 Derive dependability requirements
5.4.1 General
25 5.4.2 Specification scenarios
27 5.4.3 Dependability attributes to be specified
Figure 3 – What do we need to manage?
Figure 4 – What constraints are there?
28 5.4.4 Providing evidence and assurance of dependability attributes
Figure 5 – Assurance considerations
30 5.4.5 Decide on the level of the requirements
5.4.6 Balance the results
5.4.7 Reliability requirements
32 5.4.8 Maintainability and maintenance requirements
Figure 6 – Reliability requirements
33 Figure 7 – Maintainability requirements
34 5.4.9 Supportability and support requirements
36 5.4.10 Availability requirements
Figure 8 – Supportability requirements
38 5.5 Justify the measures used for the dependability requirements
Figure 9 – Availability requirements
39 5.6 Complete dependability specification
5.7 Review dependability specification
40 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
41 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)
43 Annex B (informative)Process for prioritizing dependability attributes
Tables
Table B.1 – Questions for prioritizing dependability attributes
44 Figure B.1 – Process for prioritizing attributes
45 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
46 C.2.5 Identify the influencing factors affecting the functions
47 C.2.6 Evaluate the technical approach to achieve the needed functions
48 C.2.7 Describe the hardware, software, and human elements involved in the system operation
49 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
50 C.2.10 Maintenance and support requirements
C.3 Derive the dependability requirements
Figure C.3 – System configuration for security service mode of operation
51 C.4 Complete dependability specification
53 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
54 D.3 Criticality of operation
D.3.1 General
D.3.2 Type of use
D.3.3 Type of users
55 D.3.4 Dependency of interacting systems
D.3.5 Structure or configuration of a system
56 D.3.6 Technical novelty
D.3.7 Novelty of operation
D.3.8 Legacy issues
57 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
58 Table D.2 – Relationship of system properties with influencing conditions
59 Bibliography

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BS EN IEC 60300-3-4:2022
$198.66