A requirement may be either covered by one or multiple Tests. In fact, the status of a given requirement goes way further than the basic covered/not covered information: it will take into account your test results.
As soon as you start running your Tests, the individual test result may be one of many and be very specific to your use case.
To make your analysis even more complex, you may be using sub-requirements and executing related Tests.
Requirements may be validated directly or indirectly, through the related sub-requirements and associated Test cases.
