Schedules of reinforcement, rates of reinforcement, variable reinforcement - these terms can become very confusing. They remind me of all the power cords that wrap around the top of my desk. As much as I try to keep them tidy and separate, they seem to twist themselves together into a confusing knot. We were certainly getting twisted into a confusing knot as we began a discussion of these terms. So I enlisted the help of Dr. Jesús Rosales-Ruiz to help sort out them out. He is sending us all a postcard from the annual Art and Science of Animal Training conference. Enjoy!