Oversite concrete is the mass concrete which is cast after the dpc or damp proof course level has been established.
Going by the definitions above it is clear that this portion as part of a building foundation is one of the most important parts of the building.
Not long ago one of my subscribers asked me on how to salvage an oversite concrete that was sinking/collapsing, before then I had also experienced a poorly done job too that resulted in parts of the concrete collapsing, so with the first hand experience and for your own  benefits if you haven't gotten to that stage of your building project is good you read on.

http://www.buildingcontractorsecrets.com/2009/08/oversite-concrete-or-german-floor.html

keep up the good work. your writeups are very educative especially to "we" (laymen) in the building sector. I really helped me in understanding stuffs that I dont b4. Once more Thanks!

@Oranges, thanks and don't mind my English