A binary decision is a choice between two alternatives, for instance between taking some specific action or not taking it. Binary decisions are basic to many fields. Examples include: * Truth values in mathematical logic, and the corresponding Boolean data type in computer science, representing a value which may be chosen to be either true or false. * Conditional statements (if-then or if-then-else) in computer science, binary decisions about which piece of code to execute next. * Decision trees and binary decision diagrams, representations for sequences of binary decisions. * Binary choice, a statistical model for the outcome of a binary decision.