Agency

• Agency at IFWiki.
• Agency: The Key to Making Fun, Immersive, Non-Linear Interactive Twine Games by Sharpe. 19-Mar-2014.
• Types of Action and Types of Agency by Emily Short. 03-Mar-2009.
• A Bestiary of Player Agency by Sam Kabo Ashwell. 22-Sep-2014.
• That Darn Conundrum by Andrew Stern. 22-Oct-2003.
  "Freedom, agency, story — pick two."
• On Games and Links: Extending the Vocabulary of Agency and Immersion in Interactive Narratives by Stacey Mason.
  (Note: You'll need to sign into academia.edu to be able to download this PDF article.)
• Formal Abstract Design Tools by Doug Church. 2014.
  A classic gamedev article that talks about intention and perceivable consequence, which are both arguably aspects of agency and worth distinguishing from one another. Intention is the player making a plan to accomplish something; perceivable consequence is the game world reacting in some way to being prodded.
• Tightening the World-Plot Interface: or, Why I Am Obsessed With Conversation Models by Emily Short. 24-May-2015.