Re: Two Question About Contract Ammendments
Your questions are very general and the answers could change depending on circumstances, but here is how I would answer them as they are written.
1. No. I would maintain that there is no such thing as a supplemental agreement that ONLY clarifies provisions of a contract. The fact that someone feels that a clarification is necessary means that there are issues which are open to interpretation. Picking one interpretation and making it part of the contract is a modification to the contract, by whatever name you wish to call it. As such, I see no bad faith in one party to a contract not being willing to accept another party's "clarification". Negotiation time.
2. A duly executed modification to a contract is effective. There may be differences in different states on the consideration issue, but I know of none in which the consideration would have to be enumerated for the modification to be effective.