DESIR (DARIAH ERIC Sustainability Refined) work package 4 Technology contributes to DARIAH’s long-term sustainability by technologically enhancing DARIAH’s research infrastructure and services. To this end four new and innovative technology areas – entity-based search, scholarly content management, text analytic services and visualisation – shall shape DARIAH’s profile. The present document forms a prerequisite for the aforementioned objective and conducts for that reason a gap analysis of the current DARIAH infrastructure, concentrating on four areas: text analytic services, scholarly content management, entity-based search and visualisation. The competencies and resources of the three technology partners in this work package correspond to these four areas. The conceptual models - as proposal for the identified gaps - are subject to later deliverables in the project, but in the course of undertaking the gap analysis already first impressions of possible conceptual models are apparent and will be presented here. The concept of the gap analysis in this context means not only to identify missing tools or services in the DARIAH infrastructure landscape but also to recognize potential for enhancement with already existing tools and services.