Interaction patterns for feedback: As a whole class with the teacher? As a whole class without the teacher? In same groups as performed the task? Re-form new groups?
Format for feedback: Discussion? Written (confidential or not?)
Feedback on: Did the students complete the task? Are they satisfied with the outcome? What have they learned from doing the task? [practical skills, language skills, lexis/grammar] What would they change if they had to do it again?