We establish different levels of abstraction, which do not strictly correspond to theoretical representations as such, but follow the idea that prosodic units to be tagged must follow a certain parametric logic in terms of positive or negative deviations at each level in their associated segments.
we consider as Level 1 (L1) the whole utterance or speech sample; as Level 2 (L2) each voiced segment within the utterance; Level 3 (L3) PPhs once they are segmented.