Queen Mary, University in London (QMUL), is currently working on evaluation methodologies for the retrieval of structured documents, in particular XML retrieval, in terms of effectiveness, efficiency, and usability. The methodologies include the creation of test beds (e.g. document collections, queries and relevance assessments) and the development of metrics that take into account the structured nature of the data, and that reflect querying and browsing users behaviours. QMUL is also working on investigating the usage of structure in multimedia digital libraries and heterogeneous digital libraries, with the aim of devising principles regarding what type of structure allows what type of (effective) access to structured content-oriented data. Another aspect that is being investigated is that of user interaction with structured content, as part of a dedicated track.