HATS: A Design Procedure for Routine Business Documents, adapted from William H. Baker’s “HATS: A Design Procedure for Routine Business Documents,” B usiness Communication Quarterly V. 64, no. 2 June 2001. Composed for the Purdue Writing Lab by Allen Brizee, Ph.D. Student, Rhetoric and Composition, Purdue University Adapted from William H. Baker’s “HATS: A Design Procedure for Routine Business Documents,” Business Communication Quarterly V. 64, no. 2 June 2001.