1.0. Safety Requirement Specification
From a health and safety study report in the United Kingdom, it has been found that, of the total number of accidents involving control systems, 44% resulted from specification-related issues, 15% from design and implementation issues, 6% from installation and commissioning, 15% from O&M issues, and 20% from changes after commissioning (indicated anticlockwise in the figure).
From the percentage failure contribution diagram in Fig. X/1.0-1 it is clear that the development activities for specification need special attention. First, we shall look at how a system specification is developed from system requirement definitions, then we shall look at the requirements for a safety system, that is, SRS.
Figure X/1.0-1 ...
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