or, how do I know who completed an Exploration, what does in progress mean, what does participating mean
Teachers can participate in an Exploration after it has been created and launched. Individual statuses can be viewed within an Exploration. There are 5 statuses of participating in an Exploration.
Not Yet Participating
"Not Yet Participating" shows which teachers have not yet begun to work on their Exploration.

In Progress
"In Progress" shows which teachers have begun to work on their Exploration, but have yet to submit it to their coach for feedback.

Participating
"Participating" shows which teachers have submitted their Exploration for feedback. They may or may not have received feedback from their coach.

Feedback Requested
"Feedback Requested" shows which teachers have submitted their Exploration, but have not yet received feedback from their coach.
Feedback Sent
"Feedback Sent" shows which teachers in the Exploration have already received feedback from their coach.
