If I have just missed the bus when I get to the bus stop, I know that I have to wait 15 minutes for the next one to come along. Given that it is absolutely freezing out, I snuggle into my parka as best I can and grimly wait out the interval. Every once in a while, though, I emerge from my cocoon to take a quick glance down the street to see if the bus is coming. My behavior of looking for the bus is on a(n) __________

(use the abbreviation) schedule of reinforcement.