This book deals with the development of modality from a crosslinguistic perspective and is closely related to two earlier volumes on the development of verb and nominal inflection in first language acquisition (SOLA 21 and 30) both methodologically and theoretically. Each of the fourteen contributions studies the early development of the form and function of expressions of deontic and dynamic agent-oriented modality or epistemic and evidential propositional modality in one of fourteen languages belonging to different morphological types and language families (seven Indo-European and seven non-Indo-European). The analyses are mainly based on longitudinal observations of children in their 2nd and 3rd years of life in conversational interaction with their caregivers, mostly the mothers. Main issues addressed are the development of directives and modulations of information in terms of certainty and evidentiality, also taking into account children's developing social-pragmatic and cognitive skills. One of the main findings is that agent-oriented and propositional modality may develop in parallel depending on the typological characteristics of the language acquired. The decisive factor is whether notions of propositional modality are grammaticized and obligatorily expressed in the language. The findings are interpreted within non-nativist theoretical frameworks (Usage-based theories, Natural Morphology).

This book deals with the emergence of nominal morphology from a cross-linguistic perspective and is closely related to Development of Verb Inflection in First Language Acquisition (ed. by D. Bittner, W. U. Dressler, M. Kilani-Schoch) both methodologically and theoretically. Each of the fourteen contributions studies the early development of the fundamental inflectionally expressed categories of the noun (number, case, gender) in one of the languages belonging to different morphological types (isolating, fusional-inflecting, agglutinating, root inflecting) and families (Germanic, Romance, Slavic/Baltic, Greek, Finnic, Turc, Semitic, Indian American). The analyses are based on parallel longitudinal observations of children in their second and early third year of life as well as their input. The focus lies on the transition from a pre-morphological to a proto-morphological stage in which grammatical oppositions and so-called "mini-paradigms" begin to develop. The point at which children start to discover the morphological structure of their language and the speed with which they develop inflectional distinctions of lexical items has been found to be dependent on the morphological richness of the input language on the paradigmatic as well as the syntagmatic axis of linguistic structure. The findings are interpreted within non-nativist theoretical frameworks (Natural Morphology, Usage-based theories).