Theme: Models Models are representations of phenomena, constructed to facilitate understanding of processes and structures that cannot be observed directly, or to make reasonable predictions. Models used in the learning of science include physical, conceptual and mathematical models. As models are approximations of actual phenomena, they are inherently inexact. Thus, models of phenomena change as Man strives to improve the models for representing, explaining and predicting phenomena. Essential Takeaways: - Models are simplified representations of phenomena. - Models are constructed to explain phenomena. - Models can be used to make predictions.