General

• Usability Professionals Association
• User Interface Evaluation in an Iterative Design Process: A Comparison of Three Techniques
• World Wide Web Style Guide-Testing-Testing
• Designing for ease of use description by Ergosoft Laboratories
• Handbook of Usability Testing: How to Plan, Design, and Conduct Effective Tests

  Expert Reviews

• Description of Heuristic Evaluations from the Usability Special Interest Group of the Society for Technical Communications
• Course handout on Heuristic Evaluations from Georgia Tech
• Description of Expert Reviews from cognetics.com 
• Expert Heuristic Reviews at Design Technologies
• Usability Inspections/Design Reviews at NN/g
• Using Usability Inspections To Find Usability Problems Early in the Lifecycle, Rosemary Marchetti (postscript paper)
• Definitions for User Interface Rating Tools

  Usability Testing and Laboratories

• Usability Problem Identification Using Both Low- and High-Fidelity Prototype
• Usability Testing for Large Software Projects
• Remote Evaluation: The Network as an Extension of the Usability Laboratory

Surveys

• Surveys and Statistics
• The Role of Online Surveys in the Usability Assessment Process article from the Usability Special Interest Group
• Rashmi Sinha's links on surveys
• Online surveys at itracks.com

Acceptance Tests

• Usability Measurement and Questionaires
• Software Usability Measurement Inventory (SUMI)
• Questionnaire for User Interaction Satisfaction (QUIS)
• Development of a Tool Measuring User Satisfaction of the Human-Computer Interface (QUIS)

• Remote Usability Evaluation
• ErgoLight Usability Software

Controlled Psychologically Oriented Experiments

• Citations for Controlled Experiments
• Slides describing Controlled Experiments
• Doing a Controlled Experiment

Sample companies that conduct usability assessments

• NN/g
• Convergent Design, Inc.
• Usability Testing at Horizon Interactive, Inc.
• Human Factors International
• Interaction Design
• The Human Factor, Inc. consulting firm 
• Usability Sciences Corporation
• UserWorks, Inc.
• XEODesign, Inc.
• UsabilityOne
• Cognetics Corporation
• IndiaCHI