Requirement traceability Sample Clauses

Requirement traceability. 5.4.1 Traceability within event-B models For large systems, it is necessary to trace requirements from the high level to the implementation. Requirements can have attributes, for instance: Vital (V) / Non Vital (NV), project name, version, phase of the project, etc. These requirements are defined apart from the event-B model (in the SRS, for instance), and have to be linked to the model. There are many requirement traceability tools to support traceability between documents/tables, but traceability within a formal model (to trace a requirement from the system event-B model to the software event-B model, for instance) is something different. Indeed, the model may be difficult to read for non B experts, so the traceability is more difficult to perform manually. Furthermore, since the model is already organized as a database with links between elements (visibility, proof...), it is possible to benefit from the existing data structure. The following traceability proposal would enable to automatically generate traceability tables from the proved model.

Requirement traceability. Customers say what they want in requirements. They can only be sure they get it by verifying that each requirement has been met. To do this, the acceptance tests must trace back to the requirements, covering all of them appropriately. Incidentally, scenarios of interest to users are good candidates for acceptance test scripts. Similarly, the developers can only be sure they are implementing all the requirements if they can ultimately - though not necessarily directly - trace each design element back to the requirements concerned, and check that each requirement is fully covered. They can also use traces in the other direction to show that each design element is actually called for in the requirements. The management of traces between engineering objects such as requirements, tests, and design elements is called traceability. It is a vital tool in managing system development through requirements. Advantages of using a requirement tool A requirements tool can help you check that there is at least one trace from each requirement to the design: if there are any untraced requirements, there is work to be done. But it can't check that the traced parts of the design are sufficient or correct - that's your job. There may be any number of links between requirements and system or test specifications: Handling traceability and change without a requirements tool is tedious, and it is easy to make mistakes. The design changes quite often and requirements need to be updated as well. On any but the smallest project, tracing requires reliable, industrial- strength tool support. To keep track of changes by hand means recording in a table each change to each requirement, each design element, and each test, and checking each time via a traceability matrix for any possible impact on other items. If you need to trace directly to design, a requirements tool that can interface directly with your design tool is virtually essential.