1. A computerized apparatus for determining coverage of testing in respect to a device, the device is associated with a set of coverage tasks and a coverage task hierarchy, the computerized apparatus having a processor, the computerized apparatus comprising: a receiver configured to receive a plurality of coverage tasks of the set of coverage tasks, the plurality of coverage tasks comprises a first coverage task and a second coverage task, the first coverage task and the second coverage task are associated with different hierarchies of the coverage task hierarchy; and a coverage determinator configured to determine coverage by a test of the device of the plurality of coverage tasks received by said receiver.