NDI, headquartered in Waterloo, Ontario, Canada and with  offices in Germany and Hong Kong, celebrated its 20th  anniversary in 2001. NDI develops, manufactures and sells 3D  real-time measurement systems for use in a wide range of  applications, from image guided surgery for orthopaedics and  neurosurgery, to industrial applications including quality  inspection and reverse engineering, and human motion research at  some of the worlds leading universities.  The company continues to build on its strengths in medical,  research and industrial markets around the world where it now  has more than 5000 installations in over 25 countries.