In this talk we will present results obtained from a recently implemented model where nucleation and growth of precipitates are simulated. Nucleation is treated by means of classic nucleation theory and the temporal evolution of the size distribution is obtained by solving the Langer-Schwartz partial differential equation. All thermodynamic quantities, e.g. driving force for nucleation, are obtained from Calphad type of databases by means of a user interface to Thermo-Calc. Results presented include ferrite precipitation in austenite.