Which of these tasks has the greatest urgency?
A simple, sorted to-do list.
This to-do list shows you one item at a time: the most urgent thing you have to do. It uses a priority queue algorithm to figure that out. Whenever you make a change to the list (e.g. Complete a task), you'll be asked some questions about the relative urgency of some other tasks.
Next up is your highest-priority task, shown in bold at the top.
Complete Task removes the top task from your queue and figures out what the next task will be. You'll be asked to rank some other tasks, perhaps ones further down your list. There shouldn't be too many.
Add Task is where you enter a new task for your list. You'll be asked a few questions to figure out its approximate urgency. Not too many.
Defer Task pushes the current task back on the list. Sometimes priorities change, or you just can't do that one thing right now. Basically, it marks it completed and then re-adds it to the list. You'll be asked a few questions about its new urgency.
Re-Sort All Tasks Sometimes your priorities change a lot. Or maybe the list has gotten out of whack. This will ask you to re-rank all your tasks relative to one another.
Show/Hide Instructions You've already figured out what that button does.