1. Industrial Avionics Working Group 18/04/07 Assessing the Safety Case Architecture Optimising the Design Architecture and Safety Case Architecture

2. Industrial Avionics Working Group 18/04/07 Assessing the Design Architecture & SCA Prioritise Change Scenarios based on probability, frequency, etc Assess candidate Software Designs and candidate Safety Case Architectures against change scenarios Recommend changes: –To the design, to improve change containment within the safety case, or –To the Safety Case Architecture, where external constraints prevent the optimal safety case architecture being used, –Or a combination of both Achieve mutually optimised solutions for both with respect to the impact of change

3. Industrial Avionics Working Group 18/04/07 An Optimised Safety Case Architecture Proposed SCA for IMS

4. Industrial Avionics Working Group 18/04/07 What is the scope of the Proposed SCA? Integrated Modular Systems Uses ASAAC-compatible three-layer stack May feature legacy products Arguments limited to those aspects which are ASAAC- compliant – scope of the Industrial Case Study May have wider applicability – terms and conditions apply.

5. Industrial Avionics Working Group 18/04/07 Proposed Safety Case Architecture

6. Industrial Avionics Working Group 18/04/07 Proposed Safety Case Architecture - Top

7. Industrial Avionics Working Group 18/04/07 Proposed Safety Case Architecture – Next Level