The project "Design of a seesaw for children with different abilities" consists of designing and structuring a mechanical seesaw for children with psychomotor problems in special wheelchairs, who require entertainment during recreation time at the Multiple Attention Center #19 (CAM #19). The design of the device represents a rather complex challenge since it not only consists of the mechanical design of the device, but there are also variables that will control the final design. These variables are both the physical and psychological safety of the child in the wheelchair who will be using the device. By obtaining psychological data on the child's behavior and stimulations, physical, static and dynamic parameters can be defined for the design of the mechanism.