text: Appendix A
  Development of Essential Fire Support and Essential Field
  Artillery Tasks
  This appendix includes an overview of development of EFSTs and EFATs. An EFST is
  an essential element of the FS plan. An EFAT is a task given to a FA unit or organization
  that supports the commander’s scheme of maneuver. An EFST is a critical element of
  the FS plan that must be accomplished for mission success. The task must be clear,
  concise, and include the elements of task, purpose, method, and effect. EFATs must
  accomplish a well-defined result in execution of the EFST.
  SECTION I – ESSENTIAL FIRE SUPPORT TASK
  A-1. The EFST states the supported maneuver task and the type(s) of effects the fires delivery unit (Army
  or joint) must provide for that phase of the operation. The task describes what FS must accomplish to support
  the operation. It consists of the objective, formation, and function. The purpose defines the friendly maneuver
  goal and states the supported commander's purpose and desired end state for the targeted enemy formation,
  function, or capability. The purpose describes the why of the EFST. The method is how we will engage the
  target using priority, allocation, and restrictions. The effect identifies the desired result or outcome the
  delivered fires and effects are to create. As the FSCOORD and FS planner’s war-game a EFST during
  planning, they identify assets to accomplish the task, and describe the desired effect to be created.
  A-2. The fire support tasks that must be accomplished to achieve the supported commander’s mission are
  designated as EFSTs. Failure to achieve an EFST may require the commander to alter the tactical or
  operational plan. Fully developed EFSTs consist of a task, purpose, method, and effect. The FA BN uses
  EFSTs that have a method of "FA" as the start point for defining EFATs. The task is described as the effect
  that fires must have on an enemy formation's function or capability. The task is enemy oriented. The purpose
  is described in terms of the benefit that accomplishment of the EFST gives to the supported commander. This
  is described as being friendly oriented. The effect is the quantified, observable result of successful
  accomplishment of the task. The effect is stated as relative condition of the friendly force in relationship to
  the enemy. For an example of an EFST checklist, (see table A-1).
  Table A-1. Essential Fire Support Task Development Checklist
  Purpose of fires – From the commander’s intent for fires
  Phase
  Task:
  Objective.
  Disrupt.
  Degrade.
  Delay.
  Destroy.
  Neutralize.
  Suppress.
  Formation – Number and type of enemy vehicles
  Function – “The enemy’s ability to… Prevent the enemy from doing ”
  Purpose: “To enable, to allow… (friendly maneuver goal)