| Abacus Web Usability | | Consultants to help you improve the user friendliness of your web site, located in Florida, USA. |
| Acernus | | Provides usability services as well as site design and site creation services for web based companies. |
| Adaptive Path | | A User Experience design and consulting firm that unites theory and practice to advance the art of user experience design while helping clients make better business decisions. Located in California, USA. |
| Adducive | | Software user interface design and rapid production services including prototypes for telephone, handheld, and desktop systems. The website describes services offered and tips for effective user interface development. Located in California, USA. |
| AGConsult | | Specialized in user-friendly Internet interface. Includes online articles. Located in Belgium, website also in Dutch. |
| Amberlight Partners Ltd. | | 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. |
| Anderson, Richard I. | | Provides guidance in collaborative, user-centered design, ethnographic research, and multidisciplinary collaboration. Located in California, USA. |
| Aptima, Inc. | | Providing innovative research and applied design for government, industry, medical, and transportation fields. Locations in Washington DC and Massachusetts, USA. |
| Ariel Performance Centered Systems, Inc. | | A management consulting and software development company that has expertise with all forms of Electronic Performance Support Systems (EPSS). Located in Ohio, USA. |
| Beta Research, Inc. | | Consulting and research in human factors, ergonomics, usability and safety in product and system design from California, USA. |
| Black Box Media | | A website and CDROM publishing company specializing in human factors for interface design, usability and usage studies, navigation and information architecture - directly for clients or through larger companies. Located in Canada. |
| Bohmann Usability | | User experience consulting. Including articles and news about Web usability. From Denmark. |
| British HCI Group Consultancy Listing | | Listing of UK academic and commercial consultants in Human-Computer Interaction, providing initial contact information for prospective clients seeking experts within this field. |
| Busse Design | | Experts in user interface design for applications and other web-based products. Located in California, USA. |
| Centralis | | A user experience consultancy offering research, testing and design expertise to develop interactive applications. Located in Illinois, USA. |
| Change Sciences | | Provides research, workshops, and consulting for improving the user experience of web sites and interactive applications. Located in New York, USA. |
| Classic System Solutions | | A software development and professional services organization with expertise in graphical user interface (GUI) design and usability. Located in California, USA. |
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