  A non--linear diffusion equation is derived by taking into account hopping
rates depending on the occupation of next neighbouring sites. There appears
additonal repulsive and attractive forces leading to a changed local mobiltiy.
The stationary and the time dependent behaviour of the system are studied based
upon the master equation approach. Different to conventional diffusion it
results a time dependent bump the position of which increases with time
described by an anomalous diffusion exponent. The fractal dimension of this
random walk is exclusively determined by the space dimension. The applicabilty
of the model to descibe glasses is discussed.
