I created Writing Power Standards to use in my sixth grade classroom, and this was a poster I created to help with Text Types and Author's Purpose. It is very basic. For author's purpose, I am just using the PIE acronym, standing for Persuade, Inform, Entertain. The text types are very basic also: Opinion, Informative, Narrative, and Poetry.
If you are interested in the Writing Power Standards for sixth grade, follow me. I will put them up on TpT after I test them in the classroom.