  Within the esoteric circle Fleck distinguishes the following subgroups: (1) vanguard, “the group of scientists working practically on a given problem”, (2) the main body, “the official community”, and (3) the group of stragglers (1935a, IV,4). In other places he omits stragglers and introduces a distinction between professionals (specialists sensu stricto) and more general specialists (1936, VI).