What motivates their actions and what do they hope to gain?

Authority—legitimate and illegitimate—is a major preoccupation in The Tempest. Throughout the play the characters usurp power from each other, and some argue that the island is essentially a colony—claimed first by Sycorax and then by Prospero. Choose 2 or 3 examples of usurpation in the play and analyze the characters’ motivations. What motivates their actions and what do they hope to gain? How are some moves to take power explained as legitimate and others condemned as treasonous? Which attempts to seize power are expected and which ones are surprises?