Cause and Effect is a very helpful structure to have.  A Cause and Effect goes way back.  It all starts with the main cause.  There's an effect to that cause but a cause can come from that effect and it continues going.  It all leads the final effect but that main cause in the beginning.

It is useful to reach an audience because it's an easier structure to grasp.  It makes sense that with a cause there is an effect. The audience understands it a lot easier.  A writer can best analyze a Cause and Effect paper by going in to detail about the initial cause.  Also, the final effect.  There can be many causes just for one final effect.  For example, the professor gave an example in class today.  He started with a cause and his final effect.  He eventually, went further in detail about the first cause.  That there were many other causes that led to that cause.