As a means to assess how much students can recall from their classmates' presentations, give students a sheet that lists all of the leaders who were presented.  Students then should number a sheet of paper for how many presentations were given.  (If 20 leaders were covered in class, there will be twenty names on the hand-out sheet, and they should number their papers from 1-20).  Display each leader's picture.  These were given to you when students completed their class presentations.  Have students identify each person.  You may also want them to recall a fact from each presentation about that leader to add to the name.