Documentation for consumers is frequently complex, convoluted, and hard to follow. Bureaucratic organizations such as insurance companies, government agencies, hospitals, and law firms often have reputations for communicating poorly. Such poorly prepared documents diminish consumers’ abilities to make informed decisions about their health, rights, and finances. When these documents leave consumers with more questions than answers, organizations must try again (and again) to communicate more clearly. With the ease of accessing documents online, organizations face increasing pressure to create effective content appropriate for broad audiences. Plain language offers an approach to language and design for producing accessible and readable public documents. This movement, which gained traction in several countries in the 1970s, has regained its momentum with recent legislation and new public and private sector initiatives. Then-US-President Barack Obama signed the Plain Writing Act in 2010 and Executive Order 13563 in 2011, requiring clear communication in plain writing from US government agencies. Other sectors have responded as well. Practitioners use plain language in a range of other areas such as healthcare, business, science, engineering, and law. In keeping with these developments, we provide this special issue to reintroduce the discussion of plain language in professional and technical communication research and practice.