By Jean-Louis Boulanger
Certifiable software program functions 1: major Processes is devoted to the institution of caliber coverage and safeguard coverage. It establishes the context for attaining a certifiable software program software. In it, the writer covers contemporary advancements reminiscent of the module, part and product line strategy. appropriate criteria are provided and safety ideas are defined and mentioned. eventually, the necessities for getting to know caliber and configuration are defined. during this booklet the reader will locate the basic practices from the sphere and an advent to the concept that of software program application.
- Presents the basic practices from the field
- Emphasizes the improvement of caliber coverage and defense assurance
- Introduces the idea that of software program application
- Covers fresh advancements akin to module, part, and the product line approach
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Extra info for Certifiable Software Applications 1. Main Processes
1 shows that a system can be in different states. The important thing is to ensure that the system cannot reach a state of incorrect and dangerous functioning. We must, therefore, identify quickly a typology of systems states. 1 represents external states (correct, incorrect) of a system and the possible transitions between these states. The system states can be classified into three families: – correct states: there is no dangerous situation; – safe incorrect states: a failure is detected and the system is in a safe condition; – incorrect states: it is an uncontrolled hazardous situation: there could be potential accidents.
Random failure occurs in an unpredictable manner and is found to be the result of a set of degradations affecting the hardware aspects of the system. ). Systematic failure is deterministically linked to a cause. The cause of the failure can only be removed through recovery of development process (design, manufacturing, documentation) or recovery of procedures. Given the nature, systematic failure is not quantifiable. 2. Evolution of the internal state of a system Failure is an externally observable manifestation of a fault (the standard IEC 61508 [IEC 08a] refers to it as anomaly).
Module and component It is important that we see a software application as a set of elements that interact to process a set of information. At this point, we speak of elements, as we have Software Application 33 moved on from the concept of monolithic software toward the concept of a structured software seen as a set of elements. – A module is a part of the software, known to be indivisible during development. It achieves a sufficiently explicit processing for it can be a direct transcription in a programming language.