Author of “How to Measure a House” based on the ANSI® Guideline; the American Measurement Standard, Death of an Industry-Real Estate Appraisal; Professional’s Dictionary of Real Estate Terms; Size Matters books and online courses; ANSI, Home Measurement, & the Power of Price-Per-Square-Foot appraisal CE course; and the Appraisal Process for Real Estate Professionals CE course. Since 2003, Hamp has promoted the establishment of a “Mandatory” national measurement standard. All real estate professionals must use the same language to create and communicate residential square footage. Until there is a universal agreement on this issue, and all Realtors® are required to be responsible for reporting an accurate square footage total in MLS, all property valuations are at risk (CMA’s appraisals, AVM’s, etc.), leaving home buyers and sellers at the mercy of who determines the size (and value) of their home. In a price-per-square-foot world, one-half of this all powerful formula is created by a hodge-podge of methods across the country. The real estate industry must find a way to join the rest of the standardized world.