In this book, Chris Collins and Paul Postal consider examples such the one below on the interpretation where Nancy thinks that this course is not interesting: Nancy doesn’t think this course is interesting.
Normally, a speaker uses a first person singular pronoun (in English, I, me, mine, myself) to refer to himself or herself. To refer to a single addressee, a speaker uses second person pronouns (you, yours, yourself). But sometimes third person nonpronominal DPs are used to refer to the speaker--for example, this reporter, yours truly--or to the addressee--my lord, the baroness, Madam (Is Madam not feeling well?).
Any theory of grammar must contain a lexicon, an interface with the mechanisms of production and perception (PF), and an interface with the interpretational system of semantics (LF). A traditional way to relate these three components in generative theory is through a derivation. Noam Chomsky's Minimalist Program postulates that grammatical derivations are constrained by economy conditions, requiring that derivations be minimal. One of the most important questions of syntax is what the economy conditions are and how they operate.