General This Recommendation has been developed in accordance to the methodology defined in Recommendations Z.332 and Z.333. The main part of this Recommendation deals with the model of routing administration and glossary of the terms used is also included. The list of operator jobs and the list of system functions to be controlled are contained in annex A. For each system function to be controlled by means of MML@ one or more MML functions can be derived and each of them can be described using the metalanguage defined in Recommendation Z.333@ in order to detail the revelant information structure. Annex B contains a list of MML functions and information structure diagrams associated to each of them to be used as guidelines.