Multitouch systems are becoming more popular replacing traditional WIMP user interfaces. A multitouch system can be based on frustrated total internal refraction of the light in an acrylic surface. With the use of commodity projectors and cameras these systems are now becoming widely affordable. Naturally the quality of these systems depends upon the right choice of material, lights, cameras and projectors. Giving its importance, there is a need for more information on this subject in the literature. This thesis presents the general design of a multitouch systems and a detailed discussion of the expected behavior of each component. A prototype was built to evaluate the proposed solution. Results are discussed to support some conclusions and suggestions of future work.