The present document defines guidance to the providers and standard makers to ensure that each service component is provided with the information needed by the user to make an informed choice. It addresses all the dimensions of ACIFO to the supplier, in order to produce the APIs according to the user expectations and whatever the number and types of additional suppliers. The present document is designed in conjunction with the user guide, ETSI EG 203 602. Each recommendation which has been identified as important for the user finds its parallel for the supplier offer, as defined in the present document. For each need and expectation, by user categories, the present document recommends relevant service information and functions. This is to facilitate, on the one hand, easy access for the user and on other hand, consistently create manageable services that are easily incorporated into a service definition that can support Service Level Agreement (SLA). The recommendations are intended for the user to be able to compose own services according to the needs, the location and activities. The concept of this new vision is detailed in ETSI TR 103 438.