Threat and Error Management
Threat and Error Management (TEM) is a safety concept regarding aviation operations and human performance. TEM is not a revolutionary concept, but one that has evolved gradually, as a consequence of the constant drive to improve the margins of safety in aviation operations through the practical integration of Human Factors knowledge.
TEM was developed as a product of collective aviation industry experience. Such experience fostered the recognition that past studies and, most importantly, operational consideration of human performance in aviation had largely overlooked the most important factor influencing human performance in dynamic work environments: the interaction between people and the operational context (i.e., organisational, regulatory and environmental factors) within which people discharged their operational duties.
TEM originated from the University of Texas Human Factors Research Project and Delta Airlines who developed a line audit methodology utilising jump-seat observations on scheduled flights. Both parties agreed that in order for the audit to be productive and show realistic and un-obscured results, confidentiality of the findings with no regulatory or organisational jeopardy to the flight crews should be guaranteed.
The initial observation forms of the audit were designed by the University of Texas researchers to evaluate Crew Resource Management behaviour on the flight deck. The process was then extended to include error and its management as well as the type of error observed. This enabled trained observers to categorise the origin, detection, response and outcome of each recorded error.
The first full scale TEM-based LOSA was conducted at Continental Airlines in 1996. Together with the original CRM indicators (leadership, communication, and monitoring/cross-checking) the extended concept of TEM was used to identify most frequent threats. This method provided a picture of the most common errors and threats, both those that were well managed and the more problematic and mismanaged.
The recognition of the influence of the operational context in human performance led to the conclusion that the study and consideration of human performance in aviation operations should not be an end in itself. TEM as developed therefore aims to enable broad examination of the dynamic and challenging complexities of the operational context in human performance.
















