The Declare Guidance

The guidance has been developed in the Declare project for the UK Control and Instrumentation Nuclear Industry Forum (CINIF). The guidance draws on research from CINIF, SSM/SKI, other Adelard projects and published research by the authors.

The UK nuclear industry sponsored project Declare (DEploying CLaims, ARguments, and Evidence) has developed and trialled a suite of short guidance documents which have now been made available by the sponsors (CINIF) to the user community.

CAE Process

The Declare (DEploying CLaims, ARguments, and Evidence) approach was developed after extensive collaboration with stakeholders and technical experts to develop a more efficient and consistent way of building and justifying safety cases using the CAE methodology.

The guidance consists of an introductory note on the CAE approach and a set of seven “mini-guides” that contain guidance on various technical aspects of CAE and its application.

The CAE approach is supported by a five-step process and the guidance is linked to the different stages of the processes.


The set of “mini-guides” contains guidance on various technical aspects of CAE and its application. Please click on the button to access or download the relevant guide.

One-page guidance - This guide contains a consolidated summary of some of the key concepts of CAE.

CAE concepts - This guide contains guidance on the concepts of Claims, Arguments, and Evidence.

Formulation of top-level claim - This guide provides advice on how to develop the top-level claim of the safety case.

CAE connection rules - This guide defines a number of rules that place constraints on the manner in which the components of CAE are linked.

CAE blocks and example - This guide describes a set of CAE building blocks, i.e. fragments that are useful for expressing the safety justification.

Summarising and communication - This guide provides guidance on how to summarise a justification, both graphically and in narrative.

Review and challenge - The process for review and challenge has its own specific guidance and should be applied throughout the CAE process, focussing on different aspects as the safety case evolves.