Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. In the software engineering community, an Architecture Description Language (ADL) is a computer language used to describe software and/or system architectures. This means in case of technical architecture, the architecture must be communicated to software developers. With functional architecture, the software architecture is communicated with stakeholders and enterprise engineers. By the software engineering community several ADLs have been developed, such as Acme (developed by CMU), AADL (standardized by SAE), C2 (developed by UCI), Darwin (developed by Imperial College London), and Wright (developed by CMU).