Extensive reading, free reading, book flood, or reading for pleasure is a way of language learning, including foreign language learning, through large amounts of reading. As well as facilitating acquisition of vocabulary, it is believed to increase motivation through positive affective benefits. It is believed that extensive reading is an important factor in education. Proponents such as Stephen Krashen (1989) claim that reading alone will increase encounters with unknown words, bringing learning opportunities by inferencing. The learner's encounters with unknown words in specific contexts will allow the learner to infer and thus learn those words' meanings. While the mechanism is commonly accepted as true, its importance in language learning is disputed .