UseLetter is a forthcoming service from Nielsen Norman Group. Principal User Advocates: Jakob Nielsen, Donald Norman

Usability Engineering for Collaborative Technologies and Web Applications

Usability consulting, training seminars, research reports, and a user experience conference. Principals: Jakob Nielsen, Donald Norman, Bruce Tognazzini ('Tog').

Usability consulting, user research, and usability management. Principals: Rich Gunther, Randolph Bias, and Scott Butler.

Vancouver-based user interaction designer Paul Hibbitts provides usability consulting, user experience design, remote user studies, remote usability ...

Vancouver-based Paul Hibbitts provides usability consulting, user experience design, remote user studies, remote usability evaluations, and ucd process training

Hallmark Consulting helps you realize user experience improvement using proven, cost-effective methods. We seek to understand both your users' needs and your ...

Usability Architects, Inc., is a consulting and contract development firm specializing in user-centered design of products and interaction, and the development ...

Nelson Usability Associates provides user research, user interaction design, usability evaluation, and training.

Usable Solutions is a user experience design, user insight, and usability evaluation consulting company. We help companies create useful and usable products. ...