This book constitutes the refereed proceedings of the Fourth International AMAST Workshop on Real-Time Systems and Concurrent and Distributed Software, ARTS'97, held in Palma de Mallorca, Spain, in May 1997.
The volume presents 24 carefully selected revised full papers. Also included are two historical contributions honoring Ramon Llull, who was born on Mallorca, as well as two invited papers. All current issues in the field of formal methods for real-time systems and distributed and concurrent systems are addressed.

This volume presents the proceedings of the Second International Symposium of Formal Methods Europe, held in Barcelona, Spain in October 1994.
Besides two invited papers and seven industrial usage reports, there are 32 full papers selected from some 150 submissions. The industrial usage reports describe practical experiences in a variety of areas including security systems and railway signalling. The subjects of the research papers include refinement, proof, process modelling, specification of programming languages, model checking, real-time aspects, and the combination of formal and systematic methods; these contributions advance the foundations of formal methods and demonstrate their practical value.