CASS is an open and transparent methodology for assessing compliance to IEC 61508 and related standards.
At its heart, there are a number of tables (assessment templates) that can be used to map evidence of compliance (the assessee’s documentation) to the relevant clauses from IEC 61508 and record the assessor’s evaluation of that evidence. The methodology guides the assessor through the various evaluations to be performed. Each template lists a number of ‘targets of evaluation’ (TOEs) relevant to a particular type of assessment.
The assessment templates are free of charge and are available from the Downloads page. There are a number of supplementary documents that, together with the templates, form the methodology. It can be used in-house to prepare evidence of conformity supporting a Self-declaration, used by external auditors or even for Accredited Certification.
The CASS methodology has been designed by industry for industry to demonstrate functional safety compliance. It offers the following advantages:
Being able to demonstrate compliance with IEC 61508 (or related standard) is important to many organisations because it:
The CASS methodology is owned and managed by The CASS Scheme Ltd, a non-trading company limited by guarantee with a membership of cross-industry institutions. The main duties of the company’s directors are to manage the ownership of the intellectual property and to control the release of new CASS documents for the benefit of industry at large.
New assessment templates or guidance documents are created by technical working groups set up within The 61508 Association under the mutual Memorandum of Understanding signed by the two parties. Thus The 61508 Association provides the main technical resource for CASS.
The Members of The CASS Scheme Ltd are: