Draw a descriptive high-level picture of your day activities by adding plans and/or facts.
Done on a single screen, using gestures only (no text inputs, scrolling).
Having planned a day, you get its quick stats view (Σ) to check that proper amount of time is assigned to all day activities.
Also, you can get back to the picture throughout your day to quickly ensure you are on track or add corrections.
As more data flows in, you can analyze your longer term planning success using a configurable Plan/Fact chart.
For your convenience, you might also want to use plan templates, and set up a daily planning reminder notification.