If you are frustrated by setting up long, cluttered lists of unrelated to-do's, you can shorten your lists by grouping like items together. Set aside one area of your to-do list for scheduled appointments. You can also group activities by category (such as "phone calls" and "correspondence").
Prioritize your groups by placing your most important activities of the day at the top (keep it to a maximum of three or four) and then list the less critical activities.