in the United States or Britain before 1980–1981, when it became much discussed and started to enter military doctrines and officer combat training courses. Application Operational art comprises four essential elements: time, space, means and purpose. Each element is found in greater complexity at the operational level than at the tactical or strategic level. This is true partly because operational art must consider and incorporate more of the strategic and tactical levels than those levels must absorb from the operational level. Although much can be gained by examining the four elements independently, it is only when they are viewed together that operational art reveals its intricate fabric. The challenge of operational art is to establish a four-element equilibrium that permits the optimal generation and application of military power in achieving the political goal. Viewing time, space, means and purpose as a whole requires great skill in organizing, weighing and envisioning masses of complex, often contradictory factors. These factors often exist for extended periods, over great distances and with shifting mixes of players, systems and beliefs, pursuing political goals which may or may not be clear, cogent or settled. Compounding factors, such as the opponent's actions, create further ambiguity. Mission analysis The operational-level strategist possesses numerous tools to frame and guide their thinking, but chief among these are mission analysis and end state. Mission analysis answers the question "What is to be accomplished?" Through mission analysis, the operational-level planner fuses political aims and military objectives. In so doing, the planner determines what application of military force will create military power to achieve the political purpose. Subordinate processes here include defining objectives and centers of gravity, but excessive dependence on analytical mechanisms can create false security. The final test rewards success, not the quality of the argument. Conversely, the planner cannot hope to "feel" a way to victory—complexity demands an integration of thought and effort. End state End state answers the question "What will constitute success?" The campaign end state is not merely a desired status quo of the military goal. It also establishes a touchstone for the tactical, operational and strategic levels. The end state manifests the intended results of military power and exposes any limitations. Indeed, an achievable end state may require the employment of nonmilitary elements of national power. As such, it recognizes that military power alone may not be capable of attaining political success. Skills required An operational-level