The choice of force field can have important consequences for simulation observations. In terms of simulating crystallization, the force field should reproduce the structure, density and stability of the crystal phase as a minimum requirement. Furthermore, the solubility of the crystal phase should be reasonably close to that determined experimentally if a comparison to experiments is intended. The properties of the solution should also be modelled accurately. For example, the free energy of solvation of solutes, their activity in solution as a function of concentration and their mobilities in the solvent are all important properties necessary to accurately capture the thermodynamics and kinetics of crystal nucleation.