This document summarizes the activities performed by the members of WP5 during the second year of project s life (M13-M24) and dealing specifically with tasks:  Internal document: Metadata and Data Sharing Tools  D5.1: Principles and guidelines for establishing and operating EU BON test sites (M12=>M15=>M27). The D5.1 document was rejected during the first evaluation of the project (1 st review, Sept 2014), and the main task was to address the recommendations/suggestions made by reviewers on the first submitted version (M15) of the document. In addition, several preparatory tasks required for a proper functioning of the network of test sites were also conducted. These tasks included metadata format and managing tools, documenting test sites, preparing data sets to be shared, and the required feedback with analytical work packages (WP3 and WP4) to check the availability of test site data to be used for their analyses. In addition, test sites actively participated in several citizen science programs and/or designed new ones for their own purposes.