The seismic economic effects of the pandemic have generated increased media attention on issues of workforce development, economic mobility, and opportunity. But as is so often the case, the more prevalent a given issue becomes in the national narrative, the muddier the terminology used to describe that issue becomes. To address that challenge, Opportunity@Work and WorkingNation partnered with a collaborative team of stakeholders and subject matter experts from several workforce-related organizations to develop this field guide, which serves as an overview of key terms and concepts related to workforce development.