One of the requirements for the grant of a patent in all jurisdictions is that the disclosure in the patent (usually, the specification) must enable persons of ordinary skill in the art to practice the invention, i.e., make the invented device or successfully practice the disclosed method. Failure to enable is grounds for invalidating a patent. In European Patent Law lack of enablement is referred to as insufficiency. See Best Mode, Disclosure. For amusement, see Death-Ray?, Where’s the