The purpose of task T4.1 has been to identify and analyse the main building blocks characterizing the current end-to-end systems in the agriculture domain, evaluating also their alignment within the value chain from data sourcing to end-user systems.The work performed in the Task 4.1 and summarised in the current deliverable, consideredthe systems developed to support all different markets of the agriculture domain (CAP, Precision Farming, Insurance and Fin-Tech, etc.) evidencing a common taxonomy that can be used as baseline to compare the different existing solutions. This comparison will allowdepicting main criticalities and existing gaps as well as potential future drivers to boost the penetration of EO based solution in the agriculture domain.The study started from the analysis of the EO based service value chain identifying the main building blocks of a common architectural model that can be used as baseline taxonomy for collecting information about the current end to end system in the EO4AGRI“System Watch and Cataloguing”.Starting from the traditional upstream and downstream components, 4 main building blocks have been defined:•Data Source•Data Access•Application services •Agri-Apps In general, the following statements applies: •Data sources are new assets that are available to different platforms and actors•Data Access and Application services are common technological elements that can be used to build complex services and applications•Agri-apps are exactly those complex services focusing on users expectations and dealing with users For each of these identified components a minimum set of characteristicsto be collected have been listedin order to prepare the work that will be performedin next task of the present Work Package (WP4): System Watch and Cataloguing. In addition, an analysis of a reference architecture following RM-ODP (modified according to GIGAS methodology) is given to create a simple common understanding of the elements involved in this big and heterogeneous picture.