It is a common theme that different phases of product development can flow into one another. This is the same case with design verification. However,due to the nature of design verification being to check that inputs=outputs, this does not mean that verification tests can just be done for no reason excessively prematurely. It is necessary to ensure that the specific area of of development is completed to a point where the verification test can be performed and no further changes will take place after a successful pass. In cases where one part of the design is held up and another is fully completed, in order to minimize delay, there could be cause to perform early verification tests.