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Circumstellar discs are expected to be the nursery of planets. Grain growthwithin such discs is the first step in the planet formation process in thecore-accretion gas-capture scenario. We aim at providing selected criteria onobservational quantities derived from multi-wavelength imaging observationsthat allow to identify dust grain growth and settling. We define a wide-rangedparameter space of discs in various states of their evolution. Using aparametrised model set-up and radiative transfer techniques we computemulti-wavelength images of discs at different inclinations. Using millimetreand sub-millimetre images we are in the position to constrain the process ofdust grain growth and sedimentation. However, the degeneracy between parametersprohibit the same achievement using near- to mid-infrared images. Using face-onobservations in the N and Q Band, the sedimentation height can be constrained.

Observing dust settling and coagulation in circumstellar discs: Selected constraints from high resolution imaging