| A | B |
| Innocent misrepresentation | You say X but X is not true. |
| Fraudulent misrepresentation | You say X and know X is not true |
| Negligent misrepresentation | You say X and you should have known X was not true |
| Frustration | Unforeseen event makes it impossible to perform contract |
| John signs when obviously drunk | Voidable contract due to lack of capacity |
| Duress | Sign here or I break your legs! |
| Counter-offer | Response to offer which brings original offer to an end |
| Acceptance | Must be communicated in order to create binding contract |
| Consideration | Price for promise |
| Specific performance | Discretionary remedy where damages are not adequate |
| Quantum meruit | Party deserves compensation for parial performance |
| Illegal contract | Void for public policy reasons |