Translators provide products and services, and work with written documents, as distinguished from interpreters, who work as oral language mediators. Although it is less common to work in both fields, except at the community level, many students in translation and interpreting schools pursue a dual-track degree or course of study. It is generally accepted that the required skill sets for translation and interpreting only partially overlap. Traditionally, translators have learned their craft informally: through on-the-job training or in unstructured apprenticeships.