The projection problem for presuppositions is the problem of how the presupposition and assertion of a complex sentence (e.g. 'John stopped accusing Mary of beating her husband') are related to the presuppositions and assertions of the clauses it contains. L. and S. propose the following projection principle for presuppositions: presuppositions of a subordinate clause do not amalgamate either with presuppositions or assertions of higher clauses; rather, they stand as presuppositions of the complex sentence in which they occur.