In order to encourage and reward classroom participation in my science classes, I keep track of student participation on my seating chart. When a student answers a question, I put a plus sign by their name on the chart. When they volunteer to put a problem on the board, I put an asterisk by their name. I give them extra credit based on how many marks they have by their name at the end of the marking period. My students know the system so they are eager to participate and gain extra credit. This is also good documentation to use at parent conferences when parents ask how their student is doing in class.