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Software in Solid state interlocking systems is designed at Saftey Integrity Level 4 (SIL 4), since errors in software leads to loss of life and great property damage. The CENELEC 128 suggests the use of formal methods in the design and coding of software. The general methods used for design are SDL, UML etc. and for coding standards such as MISRA C are used. The Software needs to go through a rigourous phases of Independent verification and validation, only then the software is certified for use.

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