John List, Sally Sadoff, Mathis Wagner, 20 February 2010

Experimental economics represents a strong growth industry. In the past several decades the method has expanded beyond intellectual curiosity, meriting consideration alongside the other more traditional empirical approaches used in economics. Accompanying this growth is an influx of new experimenters who are in need of straightforward direction to make their designs more powerful. This column provides several simple rules of thumb that researchers can apply to improve the efficiency of their experimental designs.

Elizabeth Debraggio, Cecilia Rouse , Lisa Barrow, 23 December 2008

This column shows that randomised computer-aided instruction in mathematics increased student achievement and that the effect is larger for students in large, heterogeneous classes. Also, the costs of maintaining a computer-aided instruction lab are equivalent to those associated with reducing class sizes.