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“We wrote the book on human error analysis and accident prevention”

The Global Standard in Human Factors Analysis

Wiegmann, Shappell and Associates (WSA) are an Internationally recognized team of experts in system safety and human performance. As the authors of the Human Factors Analysis and Classification System (HFACS) and the Human Factors Intervention matrix (HFIX), WSA provides a variety of services to help incorporate these tools in to your organization to improve safety, quality and efficiency.

We're confident you'll find that Wiegmann, Shappell and Associates is not your typical safety consulting company. Renowned scientists with real world experience in the field, WSA bridges the gap between theory and practice to effectively integrate human performance and system safety principles and tools into your organization.



Open HFACS/HFIX Seminar and Super-User Training:

  • Amsterdam, October 18-20, 2010
  • Las Vegas, December 7-9, 2010
To register, or for more information, click on Seminars & Training above.

Visit the new for HFACS Computer Based Training and Certification!


The HFACS/HFIX Process


A Human Error Approach to Aviation Accident Analysis


Click to watch an introduction to HFACS