D2.5 Lessons Learned and updated requirements report I

This work provides an overview of the requirements engineering work performed in the first half of the project through the iterative process adopted for the COMPOSITION project. The  documents, the Lessons Learned and changes in the requirements compared to the information provided in D2.2 Initial Requirements Specification. A further update will be provided in D2.6 Lessons Learned and Updated Requirements Report II, which is due in M28 (December 2018). A total of 26 Lessons Learned has been reported in the first cycle. Compared with the list of requirements in D2.2 Initial Requirements Specification, 37 requirements have been added. Not all of these are the result of the Lessons Learned; some are technical requirements derived from new or existing user requirements.  All requirements have been updated, though the majority not in substance, but rather as a result of adding Custom Labels for various purposes, e.g., filtering/structuring.