This Recommendation provides guidance on the factors which should be taken into account in assessing the probability of success of new services which Administrations may be considering for introduction. Such a determination will permit Administrations to be more responsive to customers' growing and changing needs, and will also permit Administrations to plan the necessary network facilities and capacities which the new service may require. NOTE - Guidance on forecasting new services for traffic engineering purposes may be found in ITU-T Rec. E.508.