Knowledge can be described as being the combination of data and information, to which is added expert opinion, skills and experience, resulting in a valuable asset which can be used to aid decision making. Knowledge may be explicit and/or tacit, individual and/or collective (CEN, 2004). According to this definition, knowledge can be perceived either as a (1) "discrete, objective, largely cognitive entity" (Newell et al., 2002, p. 3), susceptible of being classified as tacit (unarticulated expertise and experience) and explicit (knowledge formalized and expressed) (Nonaka & Takeuchi, 1995) or (2) as socially constructed and embedded in practice (knowledge as a process)
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