Draw two circles side by side. Allow the inside edge of each circle to overlap the other.
Label each circle with a subject. For example, you could label one circle "coffee" and the other "soda."
Write one or more facts that are unique to each subject within that subject's circle. Do not write these facts in the overlapping area between the circles. For instance, you might write "often served hot" in the coffee circle and "usually served cold" in the soda circle.
Write facts that both subjects share in the overlapping area of the circles. In this example, you might write "beverages" in the overlapping area.