what does this quote from Ixer (1999) means:

Practitioners are seen as applying knowledge built up from their own experience which is 'tacit' and therefore difficult to access and discuss. Reflection aims to develop conscious control of knowledge in such circumstances, through a process of metacognition, so that professionals are able to self-analyse and learn to operate more effectively in demanding situations. In essence, this means that they develop transferable skills which are lifelong and not context-specific.(Ixer, 1999)