Twenty five years ago, Stephen Krashen created five hypothesis of language acquisition theory that has been used successfully by students who want to learn a second language. Input hypothesis is one of the five hypothesis theory.

Input hypothesis indicates that language acquisition for individuals who are learning a new language is administered through the understanding of messages and the receiving input that they can comprehend.

The student learning that new language, as the input hypothesis suggests, develops by getting instructions in that language that is beyond their present state of language proficiency.

Learners acquire competence with language comprehension “i” when they are exposed to an input that is comprehensible at a higher level as Krashen indicates would level “i + 1”.

Krashen thinks that students who learn under less pressure and anxiety and adapt to the second language in their own time or comfort level of comprehending are usually the ones that learn best.

Their success and development of the language does not come from forced production and correction, but from communicating and comprehending the language at their own pace.

The input hypothesis is more geared towards language acquisition than the actual learning process.

A student who is at phase “i,” will comprehend not from that particular phase, but from a level that is a little higher, which would be level “i + 1”.

Not every student will be at the same level at the same time, so a teacher should consider this in preparing a curriculum that will address all students in the class at their own comfort level of learning a new language.

Students should learn naturally by communicating with their peers in the language that they are trying to acquire. This will put them at an advance level of comprehension that their stage would rely on.

Conclusion

Stephen Krashen tried to explain the idea of input hypothesis by giving an example of someone who spoke English, but was trying to comprehend Spanish from a program on the radio.

If you are a beginning Spanish student and have ever listened to a Spanish radio station, you know that it is very difficult to comprehend what you hear. First of all, the comprehensible input is too complicated and is lacking a context that you can identify with so as to get clues from it.  This means that the beginner Spanish listener is not at that level of comprehension. Its level is too high for the beginner to comprehend.

However, an advanced Spanish listener would be able to understand. The input hypothesis suggests only a comprehensible input a slighter level higher where the student can at least hear some of the words and phrases learned as a beginner.