Method, device, and system for identifying a model-based time dependent light scattering signature that includes receiving an experimental time dependent light scattering signature comprising experimental data descriptive of an average molecular weight of protein components in a solution over time. The method further includes identifying an Ansatz for evaluating the experimental time dependent light scattering signature, the Ansatz being an initial model-based time dependent light scattering signature, the initial model-based time dependent light scattering signature identifying at least one key variable. The method also includes adjusting the at least one key variable in the initial model-based time dependent light scattering signature until a final model-based time dependent light scattering signature is identified. In some instances, the final model-based time dependent light scattering signature identifies at least one protein aggregation mechanism.