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.
How To Find Exploration Statuses
From within an exploration, select 'View all participants' on the left side column
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.
Feedback Requested
"Feedback Requested" shows which teachers have submitted their Exploration, but have not yet received feedback from their coach.
Finalized
"Finalized" shows which teachers have submitted their Exploration and have received feedback from their coach.
Finalized Feedback Requests
"Finalized Feedback Requests" shows how many teachers in the Exploration have already received feedback from their coach.