The Art of the CMA: Win Hearts, Minds, and Loyalty by Mastering Real Estate’s Most Versatile Tool. Do you know what your home is worth? That simple question has probably the single most effective call-to-action in real estate history. Every real estate transaction depends on accurate property valuations, and CMAs are the foundational tool for agents to create and present them. Do we really need a book about the Comparative Market Analysis (CMA)? Only if you want massive success in today’s dynamic real estate market.