Verification is a process which checks that a device or a product satisfies all the regulations or specification requirements i.e. if the input matches the expected output. As agreed by most above verification can take place at different stages of the project cycle. Verification may mostly be carried out mostly in the planning phase, development phase and the execution phase. As the project cycle goes on the verification in phase is looked upon. In the planning phase focus is on creating verification tests. Based on verification tests detailed task lists are created. Here most of the verification process is carried out. In case of medical devices verification has to be carried out starting from the planning phase to the execution and manufacturing phase to check if the requirements have been met.