More juggling help: "hat" of the day

When I have several working "hats" to wear in a week - teaching, research, etc - a technique that also helps me to keep focused is setting a "hat" for each day, at the start of the week. This way I can do more related tasks in a single day thus reducing context-switching costs.

For example, this week my "hats" are:
Monday -> Teaching
Tuesday -> Big Picture
Wednesday -> PhD
Thursday -> PhD
Friday -> Teaching