th HESSD 2009 was the 7 IFIP WG 13.5 Working Conference in the series on Human Error, Safety and Systems Development which looks at integration of usability, human factors and humancomputer interaction within system - th velopment. This edition was jointly organized with the 8 TAMODIA event on Tasks, Models and Diagrams for User Interface Development. There is an obvious synergy between the two previously separated events, as a rigorous, - gineering approach to user interface development can help in the prevention of human error and the maintenance of safety in critical interactive systems. Following the tradition of HESSD events, the papers in these proceedings address the problem of developing systems that support human interaction with complex, safety-critical applications. The last 30 years have seen a signi?cant reduction in the accident rates across many di?erent industries. Given these achievements, why do we need further research in this area? Recent accidents in a range of industries have increased concern over the design, management and control of safety-critical systems. Therefore, any system that involves human lives in its functioning is subject to safety-criticalaspects. Contributions such as the one by Holloway and Johnson (2004) report that over 80% of accidents in aeronautics are attributed to human error.

Inhalt
Invited Talk.- New Requirements for Modelling How Humans Succeed and Fail in Complex Traffic Scenarios.- Human Factors in Healthcare Systems.- Integrating Collective Work Aspects in the Design Process: An Analysis Case Study of the Robotic Surgery Using Communication as a Sign of Fundamental Change.- Patient Reactions to Staff Apology after Adverse Event and Changes of Their Views in Four Year Interval.- A Cross-National Study on Healthcare Safety Climate and Staff Attitudes to Disclosing Adverse Events between China and Japan.- Pilot's Behaviour.- Cognitive Modelling of Pilot Errors and Error Recovery in Flight Management Tasks.- The Perseveration Syndrome in the Pilot's Activity: Guidelines and Cognitive Countermeasures.- Ergonomics and Safety Critical Systems.- First Experimentation of the ErgoPNets Method Using Dynamic Modeling to Communicate Usability Evaluation Results.- Contextual Inquiry in Signal Boxes of a Railway Organization.- Reducing Error in Safety Critical Health Care Delivery.