4-Criteria Model for Choosing Actions in the Moment (Getting Things Done – David Allen)
1. Context : Location, access to enabling resources influence what can and cannot be done in the moment.
2. Time available: The key is when do you have to do something else? You can’t fit a 20-minute task into 5 minutes.
3. Energy available: Starting a task that requires a lot of creative energy when you are challenged to keep your eyes open is not such a good idea.
4. Priority: Given the 3 above, choose the action that gives you the highest returns.
TrevorESSmith 
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