This is the coolest activity I have developed for calculus. You have to see the color on the activity to appreciate it--check out the preview! This activity introduces the concepts of curve sketching--when f (x) is increasing, f '(x) is positive. Students will use the same color to mark those intervals on f, f ' and f ". When f (x) is ccu, f'(x) is increasing, and f"(x) is positive. Students mark THOSE with the same color on the three graphs. Invaluable activity for introduction to curve sketching!!!!!