A stair diagram is a diagram that represents the process of how a person goes through six stages in achieving their goal. The first stage is the pre-goal stage where they are not yet committed to the goal, but they are considering it. The second stage is the planning stage where they have committed to the goal and are now actively working on it. The third stage is the action stage where they are actively working on achieving their goal. The fourth stage is the maintenance stage where they have achieved their goal and now need to maintain it. The fifth stage is the post-goal success, which occurs after someone has achieved their goal and needs to deal with any repercussions from this achievement. And finally, there’s a sixth and final step called re-evaluation which occurs when someone realizes that their current.