The negotiator is described as working behind the scenes. When that phrase appears in isolation, as an adverbial phrase rather than as a phrasal adjective modifying a noun that follows, no hyphenation is needed, but here, it serves the latter function: “Who was the behind-the-scenes negotiator who facilitated the deal?”When are hyphens required to string together a sequence of words, and when are the hyphens extraneous? The following sentences, each with a discussion and a revision, illustrate the syntactical situations in which they are necessary and when they are superfluous.