1. Death

2. Lack of consideration

3. Partial Performance

4. Indefiniteness

5. Illegality

"Will" "Shall" and "Promise"

If these words are not used, the communication between the parties is an invitation to make an offer

1. Offeror Revokes

2. Offeror Dies

3. Offer Expires

4. Offeree Rejects the Offer (counter offer or qualified acceptance)

The offeror is the master of their offer and can revoke at any time before acceptance. 

1. Applies to those who have actual knowledge of the original offer

2. Revocation does not have to reach the offeree

3. Revocation must have equal publicity to the original offer [OR]

4. Revocation must have the widest practicable publicity under the circumstances

Offers either specify a term, or have a term of a "reasonable" amount of time.

When the term is not specified, it is a question of fact for a jury.

A counter offer is made by the offeree to the offeror proposing a substitute offer to the initial bargain

A qualified acceptance is when the offeree purports to accept, but makes acceptance conditional on assent to additional terms

The voluntary exercise of power by the offeree transforming the offeror's conditional promise into a contract unless some impediment exists.