Group work

I experienced a group work which did not go well when I was a junior high school student.

An English teacher told the students to make groups and the group activity started. However, some groups didn't understand what they would do. They did not do what the teacher expected. So the activity was not successful.

I think what the teacher should have done was to show the students what they would do in the group activity enough. The teacher might have told it to the students, but students sometimes don't understand the instruction when the teacher tells them only once. So the teacher should make sure whether the groups really understand what they are going to do.