Best Practices in Mission-Assured, Mission-Critical, and Safety-Critical Systems 63 2. Overview--Should provide rationale so that the intent of the design may be understood in the event that future revisions or modifications are needed 3. Description 3.1. Function--Includes the logical intent of the function 3.2. Operation--Includes the logic of operation 3.3. List of inputs and outputs 3.4. Subsystems or systems that connect to the particular unit 3.5. Partitioning of modules 3.6. Requirements compliance 4. Appendices Topic areas that design descriptions may cover include the following: · · Architecture Electrical