Ensuring usability and systems consistency through software ergonomics, human factors science and design considerations. Located in Iowa, USA.

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

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

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

Provides design, training, and market information services. Located in Massachusetts, USA.

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

Specializes in goal-based user interface design and field studies to find out the users' goals. Provides usability assessment, e.g. expert reviews and usability testing. Located in Finland.

Offers Web design and usability testing services.

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

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

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.

Provides user experience research, user-centered interactive design and usability evaluation. Offices in Ohio and Colorado, USA.

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.

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

Employs a user-centered approach to provide User Interaction consulting, rapid prototyping, presentation and graphic design. Focus on enterprise 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.

Consulting firm specializing in customer-focused information design and interaction design of media, products and tools. Located in Belgium.

A web usability and solutions consultancy, offering user-centered ergonomic design and web development. Located in the UK.

Consulting agency offering to enhance the user experience. Includes news, events and publications. Located in California, USA.

Offers fixed and portable usability labs and logging software. Located in Chagrin Falls, Ohio, USA.

Web usability and accessibility consultancy. Based in the UK.

Offering information architecture, user experience and usability evaluation services. Located in Melbourne, Australia.

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