An apparatus comprising means configured to: receive a set of service offer descriptors, the service offer descriptor set defining one or more attributes, at least one of the attributes being associated with a plurality of different options, the set of service offer descriptors being associated with a service provider; receive a set of service requirements for a service to be provided, said set of service requirements defining one or more attributes for the service and for one or more of the attributes an associated option; and provide a set of service order descriptors for the service to be provided, said set of service order descriptors based on said set of service offer descriptors and comprising for at least one attribute of the set of service offer descriptors information indicating a selected option of the plurality of different options, in dependence on the service to be provided.