This collection of papers marks the development of empirical application of the search approach to labor economics--an approach which arose as a theoretical development of the 1960s and led to numerous insights in the 1970s. The search approach naturally incorporates uncertainty in the economic model, making up some of the early work in what is now called "the economics of information." Included are econometric issues such as estimation and specification of search models for wages and unemployment duration, continuous time models of turnover, and identification of structural parameters. Applications to policy questions including Unemployment Insurance and wage subsidy programs are given, and data collection issues are discussed within the search framework.