Mastering Assessment: A Self-Service System for Educators, 2/e (hereafter referred to as MA) is a set of 15 booklets intended to be the grist for a wide variety of professional development programs focused on educational assessment. Each of the MA booklets was deliberately written to permit a one- sitting or two- sittings reading by busy educators. The resultant brevity of the MA booklets, coupled with their being provided as separate documents, is intended to provide users of the MA system with considerable latitude in determining how best to use the booklets. A Facilitator’s Guide is available to guide educators in using the 15 booklets in their professional development programs and can be downloaded at no additional charge from Pearson’s Instructor Resource Center.