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.

Provider of usability testing and research for websites, consumer electronics, software and hardware products. Located in Texas, USA.

A consulting firm in Massachusetts.

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

Consulting services to research, design, and evaluate interactive products. Specialist in medical usability, wireless systems and complex collaborative environments. Located in the UK.

Interactive application development and design consultancy focused on crafting effective Web experiences. Located in South Carolina, USA.

User interface design consultancy creating online, desktop, and handheld products and services. California, United States.

Offers to improve customer experience. Located in New York, USA.

Experienced consultants specializing in the area of user interface design and usability. Located in California, USA.

A software development and professional services organization with expertise in graphical user interface (GUI) design and usability. Located in California, USA.