This document provides an overview of the service building activities conducted in the second year of the EUDAT 2020 project. The service building activities in the second year concentrated on further progressing on the consolidation and integration of the existing services, on the implementation the Collaborative Data Infrastructure (or CDI) architecture with support for metadata and a HTTP API, and on addressing requirements within the service building requirements procedure established in the first year. Further, the service building activities have been supplemented by an approach to define and use Technology Readiness Levels (TRL) as used by the European Commission within the EUDAT CDI and services. An initial assessment has been made to define TLR levels on current EUDAT services, either in production or in development.