“…Recent examinations of components of policy advisory systems such as political parties (Cross, 2007), the media (Murray, 2007) and partisan appointees (OECD, 2011; Connaughton, 2010b, Eichbaum and Shaw, 2010), among others, have underlined the limitations of locational models in being able to provide an exhaustive map of policy advice system types and a clear picture of how the various sources, types and components of policy advice fit together and operate (Mayer, Bots and van Daalen, 2004; Howlett and Lindquist, 2004). What is needed is a better model that links the provision of advice to larger patterns of changes in the behaviour of political decision-makers and knowledge suppliers that condition how policy advice is generated and deployed in different governance arrangements (Peled, 2002; Howlett and Lindquist, 2004; Bevir and Rhodes, 2001; Bevir, Rhodes and Weller, 2003; Aberbach and Rockman, 1989; Bennett and McPhail, 1992). Such a richer understanding of the structure and functioning of policy advisory systems can be obtained through the better specification of the second, “content”, dimension highlighted in Halligan's work and clarification of its relationship to locational considerations of influence.…”