Provider of user experience services utilizing usability testing, focus groups, market research, training and documentation. Located in California, Georgia, and Illinois, USA.

Frontend provides user-centred interface solutions for online developments and software applications. Includes the Usability Infocentre and User News newsletter. Located in Ireland.

London, UK based independent usability consultants, covering websites, interactive TV, interactive appliances and mobile Internet devices.

A usability consulting and contracting firm specializing in designing the user experience with user-centered methodologies.

Offers services to study user behaviour and apply results to create functional and usable user interfaces. Located in the UK.

Offers a range of services with a focus on user interfaces for web and non-web applications. Services available throughout the Asia Pacific. Located in Australia.

The portfolio and resume of Kyle Pero, a usability analyst, interaction designer, and information architect consultant based in Pennsylvania, USA.

Usability consulting for web, software and hardware products. Background in Human Factors. Located in Texas, USA.

Consulting services concerning User Interface Design and Usability Engineering. Located in New York, USA.

User-centered user interface design, user documentation and training services. Belgium