Bion drew a distinction between the basic assumption group and the work group. Within Bion’s perspective, there were always two groups present in every group setting — the overt or work group and the covert or basic assumption group.
This passage establishes Bion’s foundational group-psychology typology and explains how primitive covert dynamics in the basic assumption group systematically undermine the declared task of the work group.
, Group Psychotherapy with Addicted Populations An, 1997thesis