The overall aim of the GetCoSy project is to provide a methodological pathway to obtain epidemiologically relevant information from contact surveys through the construction of realistic contact networks. These contact networks will be used both for simulating the spread of infectious diseases and for developing mathematical network theory to obtain theoretical results. Existing percolation theory and critical threshold approaches will be used and refined to derive theoretical results. The project will directly link the results of contact surveys, such as the Covimod study, to epidemiological parameters, so that the contact behaviour of individuals obtained in the contact survey can be used to directly infer epidemiological parameters such as the effective reproductive number.