Increasing technological sophistication in many countries and the resulting larger world trade has indicated a need to pay greater attention to the international aspects of user interfaces. Many American companies are approaching a situation where half of their sales are outside the United States, and companies in smaller countries often have a much larger proportion of their sales outside their own country. This means that software sales will increasingly depend on their international usability and not just their domestic usability. Seen from a user's perspective more than half of the...