Audience and Genre

Most often you will chose your genre of writing in part because of its audience. For example if you know you are writing to your son to do some local chores. You wouldn't write an essay about it. Why? because its cumbersome to do so and lets face it your son would probably never read it. This point is made albeit implicitly at the very beginning of "Audience and Genre" with the example that was given. "What [things] you write...are influenced by the audience you envision." In this the "What things" could simply be taken as analogous to genre. For it is genre that decides the "What and How" of a piece of writing.