The original Guidebook was written by Katherine Cowan, Senior Adviser to the JLA, and Sandy Oliver, Professor of Public Policy at the Social Science Research Unit and EPPI-Centre, Institute of Education, University of London. Katherine oversaw versions 1 – 5.  This current version (version 6), has been updated by the JLA team at NETSCC and Katherine Cowan, with input from the JLA Advisers.