background: all recent accident models emphasis on multi causality of accidents. the suggested models emphasized on human roles in accident occurrence. the results of recent decade's studies have shown that the main causes of accidents are human and his/her unsafe acts. nowadays, application of warning signs is an important way to decrease unsafe acts . methods: in this study, the unsafe acts o...

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Max Birchwood is Director of the Early Intervention Service (Harry Watton House, 97 Church Lane, Aston, Birmingham B6 5UG) and Director of Research and Development of Northern Birmingham Mental Health NHS Trust. He is also a Research Professor at the School of Psychology, University of Birmingham. Elizabeth Spencer is a senior clinical medical officer working in Northern Birmingham Mental Healt...