Innovation can enhance the usefulness of products and services, but technological innovation may be hindered by many potential barriers. It is well-known that patents are critical for all kinds of R&D and innovation activities. Patentees can exclude others from making, selling, offering for sale, using or importing an invention into a specific country or area, when they do not get the licenses from patentees. The way to exclude patent infringement is filing lawsuits. Therefore, people are looking for a good method to evaluate and avoid the risk of patent infringement. Also, if the method can help identify opportunities, then it is better. Patent maps especially the technology/function matrix, which can match the above two requirements. This book introduces various patent maps including management and technology maps. Most importantly, it details how to build a technology/function matrix without expert.