.  Law requires a writing to modify
a.  Test – would K with the alleged change be within the Statute of                     Frauds?
i.  If yes – modification must be in writing
ii.  If no – doesn’t have to be in writing
2.  CONTRACT REQUIRES A WRITING TO MODIFY
a.  COMMON LAW – SUCH K PROVISIONS ARE IGNORED
b.  UCC – SUCH PROVISIONS ARE EFFECTIVE UNLESS                     WAIVED