Abstract: A partition system includes connecting tubes having rectangular apertures and cooperating with panels provided with upwardly directed tabs insertable within the apertures for supporting a plurality of the panels. A retention assembly attachable at the top of each tube includes a plate horizontally insertable into slots in two adjacent panels and carrying a vertically adjustable threaded member releasably engageable with the top of the tube to apply a biasing force urging the panel tabs upwardly into the tube apertures to secure the assembly of tubes and panels. The threaded member is subsequently operable in reverse to apply an opposite force between the tube and panels to facilitate separation of the panels from the tube.