The advance of Web services technologies promises to have far-reaching effects on the Internet and enterprise networks. Web services based on the eXtensible Markup Language (XML), Simple Object Access Protocol (SOAP), and related open standards, and deployed in Service Oriented Architectures (SOA) allow data and applications to interact without human intervention through dynamic and ad hoc connections. Web services technology can be implemented in a wide variety of architectures, can co-exist with other technologies and software design approaches, and can be adopted in an evolutionary manner without requiring major transformations to legacy applications and databases. Web services are currently a preferred way to architect and provide complex services. This complexity arises due to the composition of new services and dynamically invoking existing services. These compositions create service inter-dependencies that can be misused for monetary or other gains. When a misuse is reported, investigators have to navigate through a collection of logs of the composed services to recreate the attack. In order to facilitate that task, in this document we propose the design and architecture of a forensic web services (FWS) that would securely maintain transactional records between other web services. These secure records can be re-linked to reproduce the transactional history by an independent agency. In this book we show the necessary components of a forensic framework for web services and its success through a case study.