In the bottom-up model, listening comprehension is believed to start with sound and meaning recognition. Whereas, top-down processing refers to the use of background knowledge in understanding the meaning of a message.
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Answering questions is a good example of how while-listening and post-listening is combined.
Listening for the gist and setting the scene for the students before listening are the very common types of pre-listening activity.
There are many opportunities to integrate listening with the practice of other language skills, especially at the while-listening stage. Tasks like role-play, discussion, debate, writing, etc, can be used in this stage.
In post-listening, teachers test how well the students have understood what they listened to. Further, the teacher might provide activities for students to practice oral or written work.