The known knowns and known unknowns of peacekeeping data
There has recently been huge expansion in the availability of systematic data on peacekeeping missions. Data capturing the size and composition of peacekeeping operations has improved in depth and breadth, and is now complemented by a collection of disaggregated and geo-coded data. This means that rather than simply measuring the presence or absence of peacekeeping within a conflict or state, data is now available on a range of more specific indicators such as the location and response to specific peacekeeping events (cf. Dorussen and Ruggeri, this issue).