While the cash flows of a business are often estimated into perpetuity, the underlying assets that make up that business have a finite life. Measuring the termination of these assets' lifespans and the rate at which their values decline requires not only specific knowledge of their value drivers, but also a practical understanding of the tools and methods used to assess their values. In Part 7 of BVR's 2014 Online Symposium on Fair Value Measurement, expert Ray Rath discusses the principles, methodologies, and professional guidance that go into these measurements and how appraisers can best prepare themselves to value the attrition and, ultimately, remaining useful lives of all asset types.