This chapter elaborates the manifold characteristics of tacit knowledge
and knowing in the construction of expertise. Expertise and tacit
knowledge in various fields and professions have several characteristics
that are closely intertwined. The chapter considers tacit knowledge in
relation to skills and competences as well as in relation to the
questions of explication and argumentation. Furthermore, the process and
product aspects of tacit knowledge as well as individual and collective
aspects are brought into discussion. This analysis leads to the
presentation of a model in which the characteristics of tacit knowledge
and expertise are intertwined into four different perspectives. Along
with these four perspectives, the chapter touches upon current research
in which the development of expertise is understood as a collective
process combining individuals, communities, and the objects of their
activities. Although tacit knowledge and knowing are difficult to
explicate, they are closely intertwined with cognitive and emotional
aspects in experts’ thinking and action – and it may be possible to
analyse and examine them in greater detail.