This issue of RSF will focus on two important dimensions of the quality of jobs created in the past three decades in the United States. First, there has been an expansion of low-wage jobs, a phenomenon that has been documented by numerous studies, many of which have been sponsored by the Russell Sage Foundation. This proliferation of low-wage work, especially among younger workers, has contributed to the weakening of the middle class, reversing the dramatic improvements experienced by the middle of the income distribution in the three decades following World War II (Sullivan, Warren and Westbrook 2001; Appelbaum, Bernhardt and Murnane 2006). Second, there has been a dramatic increase in nonstandard jobs such as temporary help agency workers, on-call workers, contract workers, and independent contractors or freelancers. Many of these jobs are uncertain, unstable and insecure, in which employees bear most of the risks of work (as opposed to businesses or the government) and receive limited social benefits and statutory protections (e.g., Kalleberg 2011).