Adding to what Hiren Rana said, not only will the project manager need to allocate more time for R&D. The test protocols may need to revised. This would take more time and causing a delay in the tasks down the line. If the test protocols are changed, than some changes in the paperwork or times of certain tasks may also have to be changed. This also points to the importance of your first phase in any project. If the first phase or part of the project fails, it will cause delays in the rest of the project.

Also pointing to another major issue, as we learned in the past lectures, this is one of the reasons some projects are over the budget or out of the budget because the project manager is not given the budget information.