Offers web design services and features usability testing facilities. Located in Austria.

Tests and makes recommendations on how to improve commercial websites. Located in Tucson, Arizona, USA.

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

Consulting services include business analysis, information architecture, user interface design, and usability evaluations. Located in British Columbia, Canada.

Interface design and usability consulting firm which applies user centered design strategies to help businesses improve the user experience of their Web sites and consumer products. Located in California, USA.

Information architecture, interaction design, technical writing, user centered design, and usability evaluation. Located in Pennsylvania, USA.

Offering consulting services in most aspects of interaction design. Located in California, USA.

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

Specializes in the visual, interface, and interaction design of web-based applications and identities. Located in Illinois, USA.

Offers user centred research and design services, specializing in concept design, usability, accessibility product evaluations, and training. Based in Canada.