I have had the opportunity to handle a lot of Contract Law matters. A preliminary question is usually the meaning or intent of contract. Parol Evidence is evidence of parties conduct or course of dealing. This type of evidence is often at issue in contract cases.
In addition, I spend a lot of time with clients to understand main goals/objectives. In many instances, these goals can be negotiated. If a large dispute still exists, then the matter should be proactively litigated.