The design of the Kitty Cat child's snowmobile is traced from the initial concept stage through final production. The concept is taken through three distinct designs, with prototypes constructed at each stage. Objectives were established before finalization, and design parameters were developed. The most important of these, maximum operator safety, is elaborated upon. A broad-range testing program and technical innovations are discussed. Finally, the design of the project itself is treated as an item of special interest.