Pieces of software are just like paragraphs in a long story.
If you write clearly, they read like paragraphs in a good story. You know what each means, which parts of the story are where and so on.
If you are careless, undisciplined or irresponsible, any reader will trip, slip and fall among your lines and paragraphs. And your software may down a plane, shut down a bank and a hospital, or even crash some space missions.http://hopehero.blogspot.sg/2013/06/writing-clearly-crashing-into-mars.html