“…As a result, the methodology for the theoretical aspects of NDC schemes was based on Palmer (2000, Settergren (2001), Settergren and Mikula (2006) and Serrano (2015) and the methodology to analyse the experiences of Sweden, Italy, Latvia, Poland and Norway was based on Könberg, Palmer and Sundén (2006), Franco and Sartor (2006), , Chłoń-Domińczak and Góra (2006), Chłoń-Domińczak, Franco and Palmer (2012) and Christensen et al (2012), with some complementary works.…”