Scrum is founded on empirical process control theory, or empiricism. Empiricism asserts that knowledge comes from experience and making decisions based on what is known. Scrum employs an iterative, incremental approach to optimize predictability and control risk. Three pillars uphold every implementation of empirical process control: transparency, inspection, and adaptation.
The Scrum Guide is the official Scrum Body of Knowledge. It was written by Ken Schwaber and Jeff Sutherland, co-creators of Scrum. To access the full guide please visit it scrumguides.org