Clearly written agreements between parties serve as crucial components in ensuring the creation, effectiveness, success, and sustainability of any partnership. Professional Development Schools (PDSs) are no exception. Highlighted in Essential 6 of both the original and updated versions of the National Association for Professional Development Schools (NAPDS) guiding statement document, "What it Means to Be a Professional Development School" (NAPDS 2008; 2021), is the need for an articulated agreement to serve as a foundation of understanding among all parties involved. Presented in this article is the Revised Essential 6.