Checkbox placement

i.e., a square box "[_]" placed with headline to mark progress.
Let define in this way:

Placement	Purpose
Beginning: "[_] text ..."	Topic preparation/checklist -- at beginning of the topic activity.
Ending: "text ... [_]"	Progress of what to do next/later -- after the topic discussion.

I've got this idea from increment/decrement operators in C programming language.