MODUK DEF STAN 00-42: PART 4 PDF

This Defence Standard specifies requirements for procedural and technical aspects and guidelines to be followed during development of equipment acquired for the UK armed forces.

The Standard which should be read in conjunction with IEC 60706-5 Edition 2, Maintainability of Equipment, Part 5 Testability and Diagnostic Testing, provides a description of the principles of Testability and provides guidance on the related document content (usually Testability policy is part of the Project Reliability Programme Plan) and the ownership through the life of a system. The Testability policy is intended to be used throughout the acquisition chain from prime contractor down to individual subcontractors including suppliers of COTS (Commercial Off The Shelf) and GFE (Government Furnished Equipment) equipment.

The activities required for the achievement of Testability will depend on the type and development stage of the equipment, and will be specific to each project. Significant variations may be noticed between mechanical, electro-mechanical, or electronic (with or without software) or combinations of these. Testability characteristics may be largely pre-determined by state-of-the-art and/or COTS and GFE. The guidelines given in this Defence Standard shall not be considered as being prescriptive in nature; they are generic and do not attempt to be exhaustive.

Fig 1 illustrates the process diagram that can be adopted in identifying the attributes to be considered at any stage of a project, and at any point in the hierarchy of the design, in order to maximise Testability of critical system functions.