Most of the literature on the evaluation of training programs focuses on the effect of participation on a particular outcome (e.g. earnings). The "treatment" is generally represented by a binary variable equal to one if participation in the program occurs, and equal to zero if no participation...

Skills are a central source of high productivity and economic well-being. But what do we mean by productive skills? Both with regard to measurement and policy, the primary focus in the U.S. has been on academic skills, as measured by tests of reading, writing and math abilities and by...