We have used an objective method, the Path Linkage Criterion (PLC), to
identify large groupings of young stars in the Andromeda Galaxy. Prev
iously, work has been done to objectively identify the structures whic
h correspond in size to the OB associations observed in the Galaxy and
Magellanic Clouds (Magnier et al. 1993). In this work, we attempt to
identify structures which correspond to the 500 pc-sized complexes des
cribed by Efremov et al. (1987) and to test for a hierarchical arrange
ment of the observed structures. We find that complex-sized structures
can naturally be identified using the PLC, and that there is indeed a
hierarchical arrangement of the complexes and associations identified
.