I quickly take attendance by using a pocket chart. I write each student's name on both sides of a card in two different colors. As the students walk in, they flip their name card over. I know which students are absent because their names are in a different color. Writing the names on both sides in two different colors eliminates the need for me to switch all the cards over each day because I only need to turn over the cards of those students who were absent. I color code the heading at the top of the chart so that students who can't remember whether or not they switched their name can see what color it's supposed to be.