Design validation is first stage for the device development and it’s most important stage. As the design of the device is made, the main job was to validate or else to check whether the design is proper or not. So the main issues Design validation face that the design validators should not be within the team, should be a external valditors that because the within team valditors can sometime blind the issues where as the external validators can examine and raise the question against the design which leads to problem sloving of the design.