Reducing the likelihood of human error in the use of interactive systems is increasingly important: the use of such systems is becoming widespread in applications that demand high reliability due to safety, security, financial or similar considerations. Consequently, the use of formal methods in verifying the correctness of interactive systems should also include analysis of human behaviour in interacting with the interface. This report includes pre-event versions of all papers accepted for presentation at the 1st International Workshop on Formal Methods for Interactive Systems (FMIS 2006) held on 31 December 2006 in Macau SAR China, as a satellite event of ICFEM 2006. FMIS 2006 is organized by UNU-IIST in collaboration with the Human Error Modeling (HUM) project sponsored by EPSRC on research grants GR/S67494 and GR/S67500. The aim of this workshop is to bring together researchers in computer science and cognitive psychology, from both academia and industry, who are interested in developing formal and semi-formal methodologies and tools for the evaluation and verification of interactive systems. The outcome is to establish a worldwide network of researchers interested in applying formal methods to HCI. The workshop focuses on general design and verification methodologies based on cognitive psychology as well as application areas such as mobile devices, embedded systems, safety-critical systems, high-reliability systems, shared control systems, digital libraries, eGovernment, pervasive systems, augmented reality. All papers submitted to the workshop were reviewed by 3 referees followed by a meta-review process. From the 18 submissions the Program Committee selected 6 papers for long presentation (40 minutes) and 2 papers for short presentation (20 minutes). Revised versions of the 6 papers accepted for long presentations will be published after the workshop by Elsevier B. V. in the Electronic Notes in Theoretical Computer Science Series. The authors of the most relevant papers presented at the workshop will be invited to submit extended versions of their papers to be considered for publication in a special issue of a journal. In addition to contributed papers, the workshop programme also includes a keynote talk by Harold Thimbleby from the University of Wales, Swansea. His presentation is entitled "Building dependable interactive systems" and uses medical devices as a case study to discuss the problems of making interactive systems dependable. It introduces suggestions for improving them, particularly by using formal methods.