 handset technology policy over a forward three-five-year time scale. Is domain value relevant to infrastructure and network design? Certainly, all five value domains can be used to quantify cost metrics and value metrics in a radio network proposition. For example, radio-system costs and radio-system value, audio- system costs and audio-system value, positioning-system costs and positioning-system value, imaging-system costs and imaging-system value and data-system costs and data-system value can be and should be separately identified. Is domain value relevant to content management? Absolutely. Content has a direct impact on radio-system cost and radio-system value, audio value is an integral part of the content proposition but benefits from being separately identified as a cost and value component, positioning adds value to content, imaging is an integral part of the content proposition but benefits from being separately identified as a cost and value component, data systems are an integral part of the content cost and value proposition. Note that audio, image and data costs are a composite of delivery and storage cost and delivery and storage value, both are usefully described in their individual domains. Is domain value relevant to application value? Yes. Chapter 20 provided examples of this. Is it a universal model? Yes. It is certainly universally useful as a mechanism or framework for getting engineering and marketing teams to work together on product definition projects. It provides an objective basis upon which R and D resource allocation can be judged and an objective basis for deciding on 'hard to call' partitioning and integration decisions. The definition and development of user equipment with integrated radio system, audio system, positioning system, imaging and data system functionality demands particular inter- discipline design skills. Convergence increases rather than decreases the need for interprocess communication. Making multimedia handsets work with multiservice networks introduces addition