Formal methods are mathematically-based techniques, often supported by reasoning tools, that can offer a rigorous and effective way to model, design and analyze computer systems. The purpose of this study is to evaluate international industrial experience in using formal methods. The cases selected are, we believe, representative of industrial-grade projects and span a variety of application domains. The study had three main objectives: . To better inform deliberations within industry and government on standards and regulations; . To provide an authoritative record on the practical experience of formal methods to date; and . To suggest areas where future research and technology development are needed. This is the first volume of a two volume, final report on an international survey of industrial applications of formal methods. This volume describes the study, the formal methods, the cases that were studied, our approach to performing the study, and our analysis, findings and conclusion...