Peanut Butter and Jelly Sandwich

How do you make a peanut-butter sandwich?
How could you break that process into steps?
How could you break it down clearly enough that a computer could understand it?

Maybe your tutor could do a live demonstration of following your exact instructions...

Think about the Science Theater that the lectures are held in. How would you figure out how many peanut butter and jelly sandwiches it would take to fill the lecture theatre?