The LNPA WG is responsible for developing and recommending NPAC/SMS functionality requirements.  New requirements are documented in the form of Change Orders.  (The decision on whether to purchase a Change Order recommended by the LNPA WG is made by another body.)  The LNPA WG also serves as a clearing house for issues arising due to the introduction of local number portability through its Problem Investigation Process ("PIM").  In some cases, the LNPA WG resolves the problem; in others, the LNPA WG refers the problem to another industry committee for resolution.