The main argumentations in this book are summarized. The theory of PDM was proposed that can account for all attested patterns of MLM. The most challenging empirical area where PDM offers a new insight is subtractive length manipulation: the prosodically defective integration of morpheme representations might result in non-realization of underlying phonological elements. Prosodic nodes either collaterally cause non-realization since they remain unrealized but need to dominate some amount of base material or elements can ’usurp’ a prosodic node from their base that they lack underlyingly. It was shown that these mechanisms suffice to predict the wide variety of attested subtractive MLM patterns. Another area where PDM offers new insights are instances of exceptions to MLM or lexical allomorphy in the domain of MLM. The main solution PDM offers for such instances is briefly summarized: the assumption of different prosodic specification for different morphemes.