This document outlines the steps to value an intellectual property (IP) asset using the trended historical cost valuation method. It describes 6 steps: 1) describing the IP asset, 2) identifying information sources, 3) selecting relevant cost data, 4) compiling costs, 5) applying cost trend factors to account for inflation, and 6) accounting for depreciation. The valuation presented is of a patent portfolio in the healthcare sector. The trended historical cost method provides an initial valuation but may need to be supplemented by market or income approaches depending on the purpose of the valuation.