The IF Theory Reader presents an overview of the history, theory, and craft of creating interactive fiction stories. Fans of IF will find this collection an abundant resource from which to draw inspiration, as you embark on becoming an author as well as a player. Contains Emily Short's overview of NPC Conversation techniques, Graham Nelson's paper surveying Natural Language as the basis for writing IF, and the seminal essay in modern IF theory and thought, "Crimes Against Mimesis" by Roger S.G. Sorolla. As a final bookend, this electronic edition of the IF Theory Reader now includes for the the first time "The Craft of Adventure," an essay series so widely-referenced by authors within this volume that it only made sense to add it as an appendix. Anyone interested in adventure games, Zork, Infidel, Trinity, Curses, Metamorphoses, So Far, Varicella, or anything in between, the interaction fiction games of Infocom, or those that came after, those that want to be authors, rather than players -- yes, You. Come in. Read. Interact. Imagine. Do. Program. Write. Be an author. Yes. Do.