This tutorial, which is a practical introduction to Item Response Theory (IRT), is composed of six parts:
 

1	Item calibration and ability estimation
2	Item Characteristic Curve
3	Item Information Function
4	Test Information Function
5	Item-Person Map
6	Misfit

This tutorial is designed for novices, and thus, the orientation of this guide is conceptual and practical. Technical terms and mathematical formulas are omitted as much as possible. Since some concepts are interrelated, readers are encouraged to go through the tutorial in a sequential manner. You can pause and rewind any slide at any moment. Each slide has a navigation bar at the bottom. The function of each button is revealed upon mouse over.