DBMS with probabilistic model Probabilities and uncertainty taken seriously as foundation for the database model – not an add-on old idea but never taken seriously e.g. Fuhr’s Probabilistic Datalog Probabilistic retrieval model, probabilistic schema, uncertain queries, learning, appropriate data structures, etc.

IR queries for DBMS Not the same as NL queries work done in 80s Take a NL query, apply it to a DBMS, determine what type of answer can be provided may be fact-type answer (QA) may be ranked tuples (IR) Useful for distributed, heterogeneous search e.g. Hidden Web should not require wrappers