Although the human–computer interaction (HCI) community has been active for several years, very little attention has been devoted to supporting engineers. Engineers are unique computer users with particular needs. They are familiar with fields such as applied mathematics, applied sciences, simulation, project management, technical drawing, and design, as well as engineering law and economics. The nature of the engineering design process means that engineers usually operate within changing environments. Uncertainty relating to incomplete information adds to the complexity of the process especially since the engineer is legally responsible for decisions.