The Software Principles' treatment of merger clauses is better, both substantively and because it becomes important only if the parties are already in or seriously contemplating litigation, since only then would the parol evidence rule be critical. Section 3.08(c) says that for contracts of adhesion, "a term indicating that
the record is fully integrated or partially integrated should be probative but not definitive on the issue." SOFTWARE PRINCIPLES, supra note 17, § 3.08(c). This is close to the position that I take in the Corbin revision, though I think the word "probative" is too strong and should be replaced by "relevant."