This thesis was carried out without any company therefore the purpose and goal were more adapted to the contractor himself to navigate through to find a suitable solution and construct a detail for a wooden chair to achieve a result that can be applied. The purpose of the work is to come up with a detail/idea/construction of a component that will reinforce and be applied to already manufactured chairs. The method and structure of this work will be based on Professor Fredy Olsson's design process. What will weigh most on this work is based on Fredy Olsson's structure for primary and principle design, which is a good tool for finding the right concept for the component. The project was handled by pushing an idea that ultimately meets the requirements for the purpose and objectives of the problem definition. The priority was to use Catia V5, FEM – analysis and Keyshot 9 to construct a reinforcement idea to ultimately achieve the final product. In conclusion, the work will highlight different concepts, ideas, calculations, and design analysis in order to achieve the result needed.