BIGG’s second White Paper is now available online: “The need for harmonizing input data and AI Toolbox revolution in context of smart building management”. Proper implementation of new technologies on big data needs standardization of input data coming from different sources. The uniqueness of the BIGG concept lies in its creation and utilization of a distinctive Ontology. This Ontology is designed to facilitate semantic interoperability of data and empower big data analytics within buildings. In this White Paper we will explore the aim, advantages and key components of the harmonization layer of BIGG.