This book constitutes the refereed proceedings of the 4th International Symposium on Unifying Theories of Programming, UTP 2012, held in Paris, France, in August 2012, co-located with the 18th International Symposium on Formal Methods, FM 2012. The 8 revised full papers presented together with 2 invited talks and one invited lecture were carefully reviewed and selected from 13 submissions.

This book presents the refereed proceedings of the Third International Symposium of Formal Methods Europe, FME '96, held in Oxford, UK, in March 1996. FME '96 was co-sponsored by IFIP WG 14.3 and devoted to "the application and demonstrated industrial benefit of formal methods, their new horizons and strengthened foundations."
The 35 full revised papers included were selected from a total of 103 submissions; also included are three invited papers. The book addresses all relevant aspects of formal methods, from the point of view of the industrial R & D professional as well as from the academic viewpoint, and impressively documents the significant progress in the use of formal methods for the solution of real-world problems.

This volume contains the proceedings of the fourth International Joint Conference on the Theory and Practice of Software Development, TAPSOFT '93. Since the first in 1985, the aim of these conferences has been to bring together theoretical computer scientists and researchers in software engineering with a view to discussing how formal methods can usefully be applied in software development. TAPSOFT '93 consists ofthree parts: an advanced seminar, the Colloquium on Trees in Algebra and Programming (CAAP), and the Colloquium on Formal Approaches of Software Engineering (FASE). The advanced seminar includes four invited surveys and four invited conferences. The selected papers for CAAP are organized in seven sessions: specifications and proofs, concurrency, automata and counting, constraints solving, rewriting, logic and trees, analysis of algorithms, and a common session with FASE on type inference. The selected papers for FASE are presented in eight sessions: case studies in formal design and development, compositionality modules and development, formal development, foundations and analysis of formal specifications, verification of concurrent systems, model checking, parallel calculus, and a common session with CAAP on type inference.