What are the important differences between Formalism and Structuralism?

In what way does Post-Structuralism build upon Structuralism, and in what ways does it differ from Structuralism?

Derrida rejected the skeptical philosophy that many of the followers of Post-Structuralism adopted. Does this skepticism follow from the basic beliefs of Derrida and Post-Structuralism?

Eagleton criticizes many literary schools for political inaction. Why, according to his views, are literary schools obligated to engage in political activism?

If there is no such thing as literature, as Eagleton claims in the Conclusion, how is the discussion of literary theory useful?

Freud's psychoanalysis is incorporated into many literary theories and yet, as Eagleton points out, it is seriously flawed because its claims are for the most part untestable. Does this imply a defect in those literary theories that use it?

According to Saussure's linguistics, how does it follow from the...