1. This question has four parts:

• What are the elements needed to form a contract?
• Is an agreement enforceable?
• What is a "Purchase Order?
• How would you characterize the terms of a Purchase Order?

1. Is there a difference between a purchase order (Invoice) and a contract? If so, what is different between the two?
2. Are Purchase Orders (Invoices) controlled under Contract law or the Uniform Commercial Code (UCC)?
3. Is there an advantage of a contract over an invoice? If so, what are the advantages and disadvantages of each instrument?
4. Under the facts of this case study, how many transactions are there, one or two transactions? Explain?
5. How or when is an enforceable agreement formed in contract negotiation? How about with Purchase Orders (Invoices), when is an enforceable agreement established under the UCC? Is there a binding agreement in this case? Why or why not?
6. What facts are in Sally's favor of canceling the order?
7. What facts are in Jack's favor in enforcing payment?
8. In Contract Law, you must have a meeting of the minds before there is an enforceable agreement or, the Acceptance must match the Offer. What is this Contract Rule called?
9. Common-Law Contracts require that the Acceptance must not add or change any terms of an offer. What is it called when an Acceptance of an Offer changes terms of the Offer?
10. In this case, is there a meeting of the minds under the UCC using Invoices that differ in terms? Explain.
11. Have the parties formed a contract? If so, what are the enforceable terms? If not, how should this dispute be resolved?
12. What should Sally do to show she did not accept the goods? Has she accepted the goods? Explain?