What is the Wedge Model™? The Wedge Model™ shows the products of design on the left-hand side of the wedge, and system integration on the right-hand side, with verification (is the work product correct with respect to the inputs used to create it – usually “meets requirements”?) and validation (does the work product correspond to the need for the work product?) superimposed. Colloquially, verification is – have we done the job right, and validation is – have we done the right job?