A teacher draws the attention of learners to individual sounds, words and then sentences while teaching the listening skill. What approach to listening does the teacher adopt?

The bottom-up approach to listening starts from the smallest units (sounds) and builds up to larger units (words, phrases, sentences, discourse). The teacher's progression from sounds to words to sentences exemplifies this approach. The top-down approach, in contrast, starts from overall meaning and context. The bottom-up approach processes language elements sequentially from micro to macro level.