1. A computer program product comprising a machine-readable medium storing instructions that, when executed by at least one programmable processor, cause the at least one programmable processor to perform operations comprising: collecting local dependency metadata from local metadata repositories of a plurality of development systems in a layered development system landscape; creating a global where-used list comprising intra-layer and inter-layer dependencies between development entities in the layered development system landscape, the creating comprising aggregating the collected local dependency data; assigning a usage metric to each development entity in the layered development system landscape, the usage metric quantifying how frequently each development entity is depended upon by other development entities in the layered development system landscape; and promoting a measure of a relative effect of a change to one of the development entities on other development entities in the layered development system landscape.