Most of the data sources used within the PANORAMA project use very different classification systems to describe the entities they report on. Such sources include (but are not limited to) the production and trade volumes for different regions, products and industries, final demand statistics, material extraction accounts, product material composition data, etc. Various classifications used in such data sources have several major characteristics that allow distinguishing one from another (the level of detail, the units used, either monetary or physical, the name, the descriptions, etc.). To be able to combine such diverse data sources within the supply and use tables (SUTs) of the PANORAMA project, concordances between underlying classifications have to be obtained first. In this report, we described which classifications have been used within the project until now and how they have linked to each other.