This document discusses the legal concept of consideration in contract law. It defines consideration as something of value that is exchanged between a promisor and promisee in a contract. There must be an act done at the request of the promisor to constitute consideration. Consideration can move from either the promisee or a third party. The adequacy of consideration is determined by the contracting parties, not the courts. Consideration must be real and of some legal value, though it does not need to be adequate. The document outlines exceptions where an agreement can be valid without consideration, such as a written and registered gift or a promise to pay an existing debt.