Plans seldom go according to the actual plan. That can't be the reason we plan - for plans to go accordingly. There must be another reason. 

My aim with planning is to be comfortable enough to know that things are going to happen, for me to be able to get rid of the plan entirely. If I plan my week, I know exactly what needs to be done, and when it's due. I can then do my tasks in whatever order I want to. 

There's a really important lesson in this episode, on how to handle the fact that your plans aren't predictions.