The ELA Common Core Standards place an emphasis on on-demand writing and writing for real-world, authentic audiences. For students to be successful in doing this, they must understand that “One Size Doesn’t Fit All”.
In other words, writing a friendly letter at one time may be totally inappropriate for a required purpose and intended audience at a later time. This creates the dilemma of insuring that students understand Form, Audience, & Purpose and how these relate to on-demand writing. This mini lesson is a wonderful language arts test prep tool because it allows students to analyse writing prompts.