Volume 1 of 3. These volumes contain the Sheldon Course on successful selling - what, who, why, how. They represent a code of practice based upon an organization of natural laws constituting the science of constructive salesmanship. The Sheldon School was the pioneer in this field of human helpfulness. It braved the perils of an unknown and unexplored realm and blazed the way. This volume contains the following lessons: what and who of successful selling; the how of selling things; ability development, thinking; ability development, memory and imagination.