The Handbook describes the nomination process for essential use exemptions as it has evolved through Articles of the Protocol and decisions of the Parties; the procedures followed under the Protocol; and the experience of the Panel and its Technical Options Committees in managing the process to date. The Handbook contains three Sections: a review of the essential use process; instructions for the completion of essential use nominations; and appendices. The appendices contain provisions of the Montreal Protocol, decisions of the Parties to the Protocol and excerpts from reports of the Technology and Economic Assessment Panel which are relevant to the essential use process. An essential use nomination form is also included.