A method and apparatus are provided for determining a chain of individual functions associated with a service. The functions are designed to be interconnected in order to supply the service to a client entity in a communications network. The method includes the following steps implemented by a determination device: receiving from an access node to the service a temporary chain of individual functions associated with the service requested by the client entity together with a context associated with the client entity; determining an action to be performed on the temporary chain of individual functions associated with the service as a function of the context associated with the client entity; implementing the determined action on the temporary chain in order to obtain a final chain of individual functions; and sending the final chain to the service access node. This method can be implemented for supplying the service to the client entity.