  The mass assembly in star forming regions arises from the hierarchical
structure in molecular clouds in tandem with fragmentation at different scales.
In this paper, we present a study of the fragmentation of massive clumps
covering a range of evolutionary states, selected from the ATLASGAL survey,
using the compact configuration of the Submillimeter Array. The observations
reveal a wide diversity in the fragmentation properties with about 60% of the
sources showing limited to no fragmentation at the 2" scale, or a physical
scale of 0.015 - 0.09 pc. We also find several examples where the cores
detected with the Submillimeter array are significantly offset from the clump
potential suggesting that initial fragmentation does not result in the
formation of a large number of Jeans mass fragments. The fraction of the clump
mass that is in compact structures is seen to increase with source evolution.
We also see a significant correlation between the maximum mass of a fragment
and the bolometric luminosity of the parent clump. These suggest that massive
star formation proceeds through clump fed core accretion with the initial
fragmentation being dependent on the density structure of the clumps and/or
magnetic fields.
