This Recommendation focuses on the following interface: ?C Services-IF The interface between a personal health gateway (PHG) and Services. This interface is defined in the Continua architecture as described in clause 6 of [ITU-T H.810] and is shown in Figure 1-1 There are a number of Certified Capability Classes (CCCs) related to the Services-IF. This Recommendation contains interoperability design guidelines that are applicable to several CCCs. Security interoperability design guidelines are one such example. In addition@ this Recommendation contains the design guidelines for the Consent Enabled PHG and Services interface CCCs. These CCCs may be grouped with multiple other Services-IF related CCCs@ such as for example@ Services Observation Upload CCCs or Questionnaire enabled CCCs.