A plan is customarily any diagram or list of steps with details of timing and resources used to achieve one objective to do something. A plan can also be called a plot, formula, chart or diagram. A plan is merely a formulated method of accomplishing a goal.
Often a plan that is represented as a design implies some sort of graphic representation. It could also be a top or horizontal view of an object, or a large -scale map of a small area. It may also be an orderly arrangement of parts of an overall design or objective.