Summative research
It is an evaluation of a product with representative users and tasks designed to measure usability of the complete product.
Summative usability testing is usually performed later in the product development process when a product is fully developed. It is often conducted when a design is reasonably complete and involves evaluating the design against quantitative goals or competitor’s products.
It is an evaluation of a product with representative users and tasks designed to measure usability (defined as effectiveness, efficiency, and satisfaction) of the complete product.