The workshop on Control Mechanics, originated in 1988, beca-
me an annual event and gained considerable recognition in
advancing control of nonlinear and uncertain mechanical sy-
tems and promoting application of advanced mechanics in con-
trol. The fourth meeting continues the tradition with 17
papers containing original and recent work of the partici-
pants developed in 3 basic directions: feed-back control of
uncertain systems, flexible mechanical structures and flight
control.