This document outlines four categories for classifying tasks: necessity, priority, anxiety, and opportunity. A necessity is an essential task that must be completed to allow other tasks to follow. A priority is an important task for accomplishing one's stated mission. An anxiety is a bothersome task that causes unease until finished. An opportunity is a task that when completed presents a chance for new growth. The document was created by Patrick Diamitani and introduces the N.P.A.O. matrix for categorizing different types of tasks.