These are the proceedings of the ?fth international conference, Formal Methods in Computer-Aided Design (FMCAD), held 15 17 November 2004 in Austin, Texas, USA. The conference provides a forum for presenting state-of-the-art tools, methods, algorithms, and theory for the application of formalized r- soning to all aspects of computer-aided system design, including speci?cation, veri?cation, synthesis, and testing. FMCAD s heritagedates back20 yearsto someof the earliestconferenceson the subjectofformalreasoningandcomputer-aideddesign.Since 1996, FMCAD has assumedits presentform, heldbiennially...