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  • This Subject Area Index lists all CALI lessons covering Contracts.
  • The Contracts Outline allows you to search for terms of art that correspond to topics you are studying to find suggestions for related CALI Lessons.


Good Faith

This lesson considers probably the most common type of implied term, that of good faith. At common law, courts often supply a term requiring the parties to exercise "good faith" or "good faith and fair dealing". Moreover, for the sale of goods, the UCC provides that every contract is subject to good faith requirements, which cannot be disclaimed by agreement.

Implied Terms

The terms of a contract include express and implied promises, conditions, provisos and presuppositions that bind the parties. Contracts often have "gaps" in them, either intentionally or unintentionally left that way by the parties. This exercise considers how courts supply terms to fill those gaps both at common law and under the UCC.

Impossibility, Frustration, and Impracticability

This lesson takes a look at the doctrine of excuse. In particular, we will look at the doctrines of impossibility, frustration of purpose and impracticability. Each of these doctrines excuses performance of the parties to the agreement. This lesson sets out the basic requisites for when courts excuse contract performance and evaluating those situations that merit excuse. The general attributes of contract formation and breach are covered in other lessons.


At common law, in order for a contract to be binding on the parties, the terms must be sufficiently definite or the contract will fail. This lesson explores the boundaries of the doctrine of indefiniteness.

Installment Contracts

This lesson helps the user identify when a contract is an installment contract and understand the special rules that apply to installment contracts. The lesson is confined to installment contracts for the sale of goods, focusing on UCC sec. 2-612.