One indicator of the successful establishment of a field is the identification of the core competencies that are required to work within it. This is both an important step in the elaboration of a shared understanding of what a particular field consists of and a starting point for the development of training material and qualifications which may ensure good quality entrants to the field. The development of training modules and participation in on-line course and webinars are activities often engaged in by communities of practice.  Such collaboration can, in itself, contribute to the development of a field.