2.2. Derivation of functions to characterize basic processes for each modeling approach
We derived functions to model changes in bacterial contami- nation in food units as a result of partitioning, mixing, growth, inactivation and partial redistribution (Table 2). A basic process is characterized by three parameters at its initial state e the food unit size (U0), the prevalence (P0) and the bacterial level (C0, N0 or E[N0], depending on the method) e and by one or two parameters char- acterizing the impact of the basic process