To add to the previous response, design verifications and design validations are very similar however, design verifications verify the design inputs and outputs. Design validations check that the user required specifications are met, and the that the medical device is validated for its intended use. Design verifications occur through in house testing by engineers within the company, and validations are performed by nurses or doctors who would actually use the device. Validations are a good way to see how the user interacts with the device which gives a different perspective because the engineers/developers in house are so used to using the device during its development that they may miss some obvious things to correct with the device.