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

Offers customized user experience and branding solutions. Notable clients include Macromedia and WebEx.

Offering user experience research services and consultation in usability for the products of the digital world, especially wireless ones. Located in Finland.

Provides analysis and designs interactive systems and interfaces for usability across all technology platforms. Located in New York, USA.

Usability for Flash. Promotes mainly a book, and includes tips, tutorial, and links.

Specializes in usability engineering, graphic design and software engineering, Located in Germany (Ludwigsburg, Dortmund, Mannheim, Munich).

Providing innovative research and applied design for government, industry, medical, and transportation fields. Locations in Washington DC and Massachusetts, USA.

Specialists in designing usable, useful and aesthetic interfaces for interactive products, ranging from software applications to handheld devices and medical equipment. Located in California, USA.

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

Customer research, information architecture and design, and usability evaluation of technology products and websites. Offices in Michigan, California, and New York, USA.