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The Spaak method, also known as the Spaak-Schlüter method, is a negotiation method named after Paul-Henri Spaak and Maurice Schlüter. The method involves using a small group of negotiators to draft a preliminary agreement, which is then presented to a larger group of negotiators for final approval. The Spaak method is often used in international negotiations, as it allows for a more informal and flexible approach to negotiation.