Offers usability testing, UI design and customer research services. Located in Washington, USA.

Offering user-centered interface design, auditing, and prototyping solutions for online and MS Windows applications. Located in Ireland.

Helps businesses sharpen their websites. Provider of website analysis, reality testing, training seminars, and consulting services. Located in Illinois, USA.

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

Consultants who design user experience in the shape of graphical user interfaces on the internet and in the wireless world. Located in California, USA.

Specializing in the conceptualization, design, development, evaluation, review and assessment of human-computer interfaces, especially web-based applications. Located in California, USA.

Specialized in user-centered design, prototyping, support of the development process, and iterative test and refine of the final product. Includes articles by Jim Miller. Located in California, USA.

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

Specializes in site and user interface development, web consulting, and training.

Usability Consultancy committed to designing and evaluating successful and effective Windows Applications and Web Sites. Offering the full range of Usability Services. Located in the United Kingdom.