Without control structures, a program would just be a series of instructions executed in sequential order. This is fine for very sim ple program s, but m ost program s, like the driving directions exam ple, aren't that sim ple. The driving directions included statem ents like, Continue on Main Street until you see a church on your right and I f the street is blocked because of construction…. These statem ents are known as control structures, and they change the flow of the program 's execution from a sim ple sequential order to a m ore com plex and m ore useful flow.