Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Networked European Software and Services Initiative, NESSI, is a European Technology Platform on Software Architectures and Services Infrastructures. A European Technology Platform (ETP) is a private-public partnership involving industry and academia that aims to define and coordinate research in areas that are of strategical economic interest for Europe. To achieve its targets, an ETP unites the relevant stakeholders to a) define a Strategic Research Agenda (SRA) and b) coordinate and pro-actively contribute to its implementation. While each ETP defines its own organisation, ETPs are open to all relevant stakeholders, whether users or providers. ETPs collaborate with the European bodies in providing inputs to the research directions and programmes and position papers on key issues. ETPs are not funded by the European Commission and do not participate in any way to the evaluation process of research proposals under the on-going Framework Programmes.