1. See-through HMDs, wireless communication and multi-modal input technologies, distributed software architectures

2. Clinicians perceptual surround filled with 3D information components superimposed on "real" environment
   • Continuous hands-free information access
   • Navigation and interaction through object "control surfaces" and "instrumented environments"

3. Development strategy: design and evaluate components
   • Representational issues
   • Presentational issues