The purpose of this document is to outline the guiding principles that should be used by Member States of the Pacific Tsunami Warning and Mitigation System to manage local-source tsunami events. This is not intended to be a detailed, prescriptive procedure, but an outline of agreed best practice to assist Member States in developing their own response and readiness procedures and plans. Currently this document is largely designed for local tsunami generated by large earthquakes, but in future could be extended to be include tsunamis from volcanic, landslide, and non-typical sources.