Parliaments perform an important democratic function in overseeing and scrutinising government, making new laws, and debating the issues of the day. Effective research use can ensure that policies are cost effective, ensure that those debating and scrutinising policy are informed by the best possible evidence, and scrutinise the work of government effectively. Yet, despite having a long history, little is known about how research is used in decision making. The ways that research feeds into parliamentary processes were examined in a recent session organised as part of the 2015 PACITA conference. This chapter outlines two empirical examples of work in this area: an analysis of two parliamentary debates and the work of an internal parliamentary research advisory service. However, gaps in knowledge remain. The chapter goes on to discuss a study being conducted, which is examining how research, of all types, feeds into parliamentary processes and the demand for such services from policy makers and parliamentary staff.