Here the issue before us is whether the MOU representing the settlement agreement reached by the parties is an enforceable contract. "The interpretation of a contested written contract is a question of law ordinarily appropriate for disposition by summary judgment. See Lumber Mut. Ins. v. Zoltek Corp., 419 Mass. 704, 707 (1995) ; LoCicero v. Hartford Ins. Group, 25 Mass. App. Ct. 339, 341 (1988). A dispute over a writing clearly stating the rights and duties of the parties becomes especially suitable for summary decision. See USTrust v. Henley & Warren Mgmt., Inc., 40 Mass. App. Ct. 337, 341-343 (1996)." Targus Group Int'l, Inc. v. Sherman, 76 Mass. App. Ct. 421, 428 (2010).