A publication from January this year - How the EU works and Justice and Home Affairs decision-making - outlines the institutional and legislative process of decision-making in the Justice and Home Affairs field, as well as providing historical background and context.
A Statewatch publication from December 2010 outlines some of the changes to the EU decision-making process following the entry into force of the Treaty of Lisbon. The diagram below sets out the interactions between different EU institutions.