GrapeSEED is a research-based oral language acquisition and critical listening program for children that allows students to obtain the English language naturally. This natural approach, developed by Stephen Krashen, a linguist and researcher in the fields of second-language acquisition and bilingual education, and Tracy D. Terrell, an education theorist, is intended to give language learners the ability to "communicate with native speakers of the target language" by having students, who are taught in a classroom setting, first comprehend the language, and then "Speech (and writing) production emerges as the acquisition process progresses."