Input refers to the language a learner is exposed to, such as using simpler structures and vocabulary when speaking to non-native speakers. Negotiated input allows learners to acquire language through clarification requests during interaction. Output is the opportunity to produce comprehensible language in meaningful interaction, which is important for developing L2 ability but difficult to provide in large classes.

1. Input and Output
The term input is used, as in L1 acquisition to describe
the language that the learner is exposed to
It can be made a comprehensibly being simpler in
structure and vocabulary as a foreigner talks
For example: native speaker of English may try to ask an
international student English class, you like it? Instead of
How are getting on in your studies?

2. Negotiated input in L2 material that the learner can
acquire in interaction through requests for clarification
while active attention is being focused on what is said
Output: the opportunity to produce comprehensible
output in meaningful interaction seems to be another
important elements in a learning development of L2
ability, yet it is one of the most difficult thing to provide
in large L2 class