Much of the complexity in bridge arises from the difficulty of arriving at a good final contract in the auction. Standard American Yellow Card is a specific set of partnership agreements and conventions, using Standard American as a base. Standard American Yellow Card is a very specific collection of agreements, which can, of course, be modified and augmented by partnership agreement. In practical use, the term is often mis-used to refer to Standard American in general, or it could refer to a system that used SAYC as a base and made additional augmentations or changes to the base agreements.