Dissertation thesis is focused in production costs and their dependence on theproduct design. There is stated how single parts of gearboxes affect the production costs.There is the design process, its phases, and its the best procedure, the suitable workingteam, its composition and the need for cooperation described. The effect differentproduction technologies on the production and the production costs is written. The fact thatdesigner can affect production costs is very important.Dissertation thesis analyzes influence design of real gearboxes parts and their affect inproduction costs.