Interface Design consultation for browser-based and traditional software as well as interactiveTV.

Boston Web firm offering information architecture, interaction design, usability consulting, and copywriting.

Texas design consultancy specializing in user interface and interaction design, visual communication, and usability for products requiring human-computer interaction.

Offers user experience design plus usability and product strategy consulting. Also other services concerning interactive products.

A team of designers, programmers and usability specialists from Nortel Networks' former human factors group offer web design and usability evaluations. Located in Canada.

Consulting firm with focus on simplicity and usability. Located in Canada.

Usability testing, customer research, and product design services. Located in Washington, USA.

Provides research, workshops, and consulting for improving the user experience of web sites and interactive applications. Located in New York, USA.

Offers service for designing online-help system, user documentation and translation. Located in Oslo, Norway.

Sim D'Hertefelt offers services for designing usable interactive systems, includes articles. Located in Belgium.