This design guidelines document focuses on the following interface: ?C Services-IF The interface between a Personal Health Gateway (PHG) and Services. There are a number of Certified Capability Classes (CCCs) related to the Services-IF. This design guidelines document contains interoperability design guidelines that are applicable to several CCCs. Security interoperability design guidelines are one such example. In addition@ this design guidelines document 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@ Observation Upload CCCs or Questionnaire enabled CCCs.