16.Materials should provide opportunities for outcome feedback.
Feedback which is focused on the effectiveness of the outcome rather than just on the accuracy of the output can lead to output becoming a profitable source of input.
Therefore, a learner who is successful to achieve a particular communicative purpose will gain positive feedback on the effectiveness of the use of the language for further language outcome.
In relation to this, materials developer has to be sure that language production activities have intended outcomes other than just practicing language.