The document discusses several models that attempt to explain human migration patterns: the gravity model, Stouffer's intervening opportunity model, the stepwise migration model, Lee's push-pull model, and Zelinsky's model of mobility transition. It asks students to have each group present one migration model, explaining how it works, and to discuss the strengths and weaknesses of each in explaining real-world migration, considering whether the models describe reality accurately or oversimplify, are merely descriptive or prescriptive, and maintain usefulness over time and space.