This volume contains the refereed proceedings of the ?rst edition of three wo- shops colocated with the International Conference on Formal Techniques for Networked and Distributed Systems (FORTE). The workshops took place in Toledo (Spain) on the 1st and 2nd of October of 2004, and they dealt with d- ferent topics related to the application of formal methods. The names of the workshops were the following: - TheFormEMC: 1st International Workshop on Theory Building and Formal Methods in Electronic/Mobile Commerce - EPEW: 1st European Performance Engineering Workshop - ITM: 1st International Workshop on Integration of Testing Methodologies In total, the calls for papers of the workshops attracted 62 high-quality s- missions. The program committees of the workshops selected 27 papers after a rigorous review process in which every paper was reviewed by at least three - viewers. In these proceedings,the papersaregrouped accordingto the workshop they belong to. In addition to the selected papers, there was a keynote speech by Prof. Rob Pooley, from the Heriot-Watt University, UK. We wantto express our gratitude for their ?nancial support both to the U- versidaddeCastilla-LaManchaandtotheJuntadeComunidadesdeCastilla-La Mancha. Besides, we are in debt to all the authors who submitted high-quality papers to the workshops: Without their e?ort and interest, it would have been impossible to organize the workshops. We would also like to thank the program committee members of the three workshops for their collaboration during the reviewing process.