Adopts ISO/IEC25010:2011 to define a quality in use model composed of five characteristics that relate to the outcome of interaction when a product is used in a particular context of use. This system model is applicable to the complete human-computer system, including both computer systems in use and software products in use. It also defines a product quality model composed of eight characteristics that relate to static properties of software and dynamic properties of the computer system. This model is also applicable to both computer systems and software products.