Debriefing means having a conversation or discussion after an event or activity to talk about what happened, share information, and learn from the experience. Full definition
The specific qualitative data sources include teachers» written lesson plans, university faculty members» reviews of lessons, transcripts and videos of implemented lessons, and recordings and transcripts of debriefing sessions about implemented lessons. (citejournal.org)
In debriefing with them afterwards, I heard the following: (slaw.ca)
A lesson study cycle involves having a group of teachers collaboratively construct a lesson on a shared learning goal for students, implement it, observe the implementation, and then debrief on the strengths and weaknesses of the lesson. (citejournal.org)