An exercise could be: one person thinks of a task that the class has to do, and in order to do the task the students need specific information. The person who made up the task starts by giving information as general as possible. Each time someone asks him to be more specific for a specific detail, he does that, until the things he says are specific enough to give the students the details they need to know in order to complete the task. ETA: i'll Be Specific later :D