Natural Morphology is the term the four authors of this monograph agreed on to cover the leitmotifs of their common and individual approaches in questions of theoretical morphology. The introduction summarizes the basic concepts and strategies of Natural Morphology, to be followed by Mayerthaler who deals with universal properties of inflectional morphology, and Wurzel with typological ones which depend on language specific properties of inflectional systems, and Dressler with universal and typological properties of word formation. The final chapter by Panagl is an indepth study of diachronic evidence for productivity in word formation and for the overlap of word formation with inflectional morphology.