The purpose of this project was to, with the help of supervisors and colleagues, develop a concept suggestion for a surfing leash that is better than the ones found on the market. The purpose was also to create a decision basis for Invencon AB for the continuance of the development of the concept. A planning phase started of the project. In this phase a project plan was created where, for example, the methods to be used were defined and their different time-schedules where specified. A feasibility study was then performed, and the information gathered from the study was summarized into a market requirement specification. This specification was used as a guiding document in the idea generation and during the development of the different concepts. A final concept was chosen at the end of the concept selection phase. This concept was presented to the project commissioner. A handover of relevant documents to the project commissioner was made to facilitate their decision on the continuance of the project. The developed concept has an integrated quick release in the ankle straps clamping function. This allows for the surfer to detach from the surfing leach both safer and faster in a dangerous situation. On both the ankle strap and on the railsaver there are developed attachments where the cord is to be attached. These attachments are designed so that each part of the conceptual surfing leash can be replaced individually. This allows for the surfer to only replace the damaged parts of his surfing leash. A technical requirement specification was also created. This aimed to facilitate the continuance of the project, if the decision is made to continue developing the concept. The conclusion of the project is that it is important to create a comprehensive view over the surfing leashes performance and to where focus should be aimed. A heavy-tailed process was therefore important for the end-result, i.e. to direct a lot of time to the phases that lead up to the concept selection phase. It was also clear that cooperation and discussion was important in a project that aims to create concepts. To be able to discuss ones thoughts and ideas with a project partner has facilitated both the generating and the validating of ideas. To work with a detailed plan and have a clear structure in the work was vital when working close to a project partner.