The National Library of Technology (NTK) runs two invenio repositories - National Repository of Grey Literature (NUSL; v1.1.2) and instituional repository of NTK (IDR; v1.0.0). The repositories have partly same typology and data models. We have just started on works on upgrade and creating new data model. For now we are discovering which parts are missing and we still need to keep them as e.g. collections and we try to figure out the best and the easiest solution for our repositories what includes revision of whole concept and their funcionalities.