Specializing in interface design, usability testing, site development, database architecture, and ecommerce sites. Located in Pennsylvania, USA.

Usability Consulting firm based in Leighton Buzzard, UK. Focuses include making web sites and particularly web forms easier to use.

User interface design and usability consulting for Windows applications and web sites, for business productivity.

Independent usability and user-centred design consultancy, based in Stockholm, Sweden.

Provides details of the user experience consultancy services available, including usability, web accessibility and international user research.

Specializes in Human Factors and Applied Ergonomics. A consultant company involved in web site analysis, HCI, task analysis and modeling. Located in Canada.

Consultants providing information architecture, visual interface design, icons, and usability testing. Located in California and Hawaii, USA.

Award-winning web site development, user interface, user experience consulting and communication design. Includes short articles. Located in California, USA.

Australia-based consulting group specialising in eBusiness usability and accessibility.

Helps corporations achieve specific business results by providing research, and a user-centred approach to the design and use of digital technologies. Located in the United Kingdom.