In interrelations of adjacent occupations every occupation shows clearly the possibility or the impossibility of its professionalizing. Accordingly I analyze the interrelations on medical occupations, legal ones, and so on.
Between adjacent occupations, one occupation is prevented from professionalizing by the other occupation when the job territory of the former overlaps with that of the latter, or the function of the former can be included by that of the latter. The cause of non-professionalizing is A or B.
A. The theoretical knowledges which both or either of those occupations uses are insufficiently systematic.
B. The technology of the former occupation is confined in a part of vertically divided service process while that of the latter occupation is not confined.
Therefore, by the removal of each cause, the occupations whose job territories overlap with those of their adjacent occupations, or whose functions can be included by those of their adjacent occupations professionalize to a high degree. But all the occupations can not remove each cause. Some of the occupations can remove it and others can not.