In addition to these characteristics of information, the social and organisational aspects of knowledge systems have also been the subject of recent research. One strand of this discussion emphasises the distinctiveness of different knowledge systems, often focusing on three types of knowledge: scientific, Indigenous and local, and the latter are two sometimes grouped as 'traditional' knowledge . This strand emphasises the specific forms of knowledge production and circulation in each type. Another strand of discussion emphasises the networks of interactions between different groups. This strand follows the influential 'Knowledge systems for sustainable development' , which was cited in Chapters 2, 7 and 8 in WGII AR5; Cash et al.  emphasise the usability and acceptability of scientific knowledge, and highlight the
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