Listening skills are the ability to accurately receive and interpret messages in the communication process. Listening is key to all effective communication. Effective listening is a skill that underpins all positive human relationships. A listener uses both the bottom-up and top-down processes of listening. Bottom-up sub-skill of listening:The bottom-up process involves selecting details and finding stressed syllables using sound, word order, pause, stress, and intonation as a guide.Bottom-up processing in listening is to encode messages moving from sounds to words, phrases, clauses, and other grammatical elements to sentences.It concentrates on individual sounds, words, and phrases while listening to recognize prominent details rather than the meaning of the text as a whole.Bottom-up processing happens when someone tries to understand language by looking at individual meanings or grammatical characteristics of the most basic units of the text, (e.g. sounds for listening or words for a reading), and moves from these to try to understand the whole text.Thus, it can be concluded that finding the main ideas is not a bottom-up sub-skill of listening.Additional Information A top-down sub-skill listening process is a listening approach that focuses on looking at language as a whole to find the main ideas rather than individual sounds, words, and phrases. It concentrates on the meaning rather than grammatical structures and individual words.