The event was controversially re-opened to bidders at the end of last year after the UK government decided it would cost too much money to pay for an athletics stadium in Picketts Lock, north London.
The IAAF also rejected the British government's proposal to move the event to Sheffield in the north of England.
A final decision on where the Games will be held is expected to be made on April 14 in Nairobi.
In the meantime the IAAF would have now received detailed bid documentation from the six cities (Rome, Berlin, Moscow, Brussels, Budapest and Helsinki) and will undertake a series of site visits in March.
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