The principle of the development of the force field is to determine the parameter set that can best reproduce the AIMD results for the system energies, stresses, and forces on each atom. This procedure has been applied to creating potential parameters for solid and liquid silica, low-pressure crystalline silica, lithium thiophosphates, and water. In this approach, the objective function is minimized with force-matching algorithms to generate the best parameter set, and it can be applied flexibly to any molecular system; for example, parameters that do not appear in the force-field database can be optimized while keeping other parameters fixed. The details of the optimization method will be described in "Optimization" Section.