  The past decade has seen an increase of star formation studies made at the
molecular cloud scale, motivated mostly by the deployment of a wealth of
sensitive infrared telescopes and instruments. Embedded clusters, long
recognised as the basic units of coherent star formation in molecular clouds,
are now seen to inhabit preferentially cluster complexes tens of parsecs
across. This chapter gives an overview of some important properties of the
embedded clusters in these complexes and of the complexes themselves, along
with the implications of viewing star formation as a molecular-cloud scale
process rather than an isolated process at the scale of clusters.
