Flex-It is a declarative query language allowing users to query graph data whose structure is complex, not fully-known or ever-changing, or where there is a requirement for the intelligent exploration of a graph. Flex-It performs both approximate matching and relaxation of the user’s query, and ranks the answers according to how closely they match the original query. This is of especial relevance in areas where there are large volumes of complex, heterogeneous data with ever-evolving schemas; these include bioinformatics (and other scientific disciplines), financial information and social networks, among others.