Army Doctrine Publication (ADP) 3-90 provides the doctrine on the conduct of offensive and defensive tasks. It establishes a common frame that commanders, supported by their staffs, use to plan, prepare, execute, and assess offensive or defensive tasks. The doctrine in this publication is a guide for action rather than a set of fixed rules. ADP 3-90 also forms the foundation for training and Army education system curricula on the conduct of tactical offensive and defensive tasks. In operations, effective leaders recognize when and where doctrine, training, or even their experience no longer fits the situation and adapt accordingly.