“…However, while both approaches give important insights, they are rarely treated together. Most academic analyses evaluating cluster policies have focused on one or the other; typically either case studies highlighting contextual elements (see for example : PARRILLI, 2004;PITELIS et al, 2006;ARANGUREN et al, 2008;BORRAS and TSAGDIS, 2008) or evaluations seeking to quantify direct effects in terms of a specific 'hard' outcome (see for example : HUGGINS, 2001;MCDONALD et al, 2007;MARTIN et al, 2011a;2011b;DE LA MAZA et al, 2012). The reality of cluster policies, however, is that the relationships between tangible and intangible effects are extremely difficult to de-limit.…”