I am presently teaching a control technology course to middle school students. I utilize the Lego Mindstorms RCX Robotic Invention System for the design and major project. The provincial curriculum requires, as a component of the control technology course, some treatment of pneumatics and hydraulics. I currently use hydraulic and pneumatics kits consisting of syringes of various volumes and rubber tubing. Students learn the mechanics of hydraulics and pneumatics and then engage in the construction of a pneumatically controlled robotic arm. The students really enjoy this activity and learn quite a bit about the mechnics of a pneumatic system. However when we move on to the Lego Mindstorms robotic design, there new found knowledge regarding pneumatics goes by the wayside. It seems that the Lego robotics kits would lend themselves well to pneumatic components. Are there pneumatic add ons which can be purchased to use with the Lego Mindstorms RCX. Integration of the two topics would no doubt lead to greater learning potential for my students.