Much research is interested in the role that executives and committees play in setting the legislative agenda in parliamentary democracies, but progress in this area has been limited by a lack of comprehensive time-series data on agenda setting powers in different countries. In this paper, I seek to address the gap in three ways. First, I propose a detailed scheme for classifying rules in six principal dimensions of executive and committee agenda power. Second, I apply this scheme to develop a time series of agenda-setting powers in 18 European democracies for the period 1945-2011. Finally, I demonstrate the utility of the new dataset by examining how partisan and non-partisan factors shape legislative organisation in parliamentary democracies.