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3.3 Research milestones

- Volterra und Taeschner (1978):
-- Girls, Lisa, Giulia, German and Italian
-- Rome (Italy)
-- One person → one language (a)
-- Lisa between age 1;5-3;6; Giulia between age 1;2-2;6
-- Diary, monthly audio recordings
-- Equal amount of input
-- Balanced bilinguality
-- Three-stage-model:
--- 1. Single/mixed lexical and syntactic systems
--- 2. Separate lexical systems, single syntactic system
--- 3. Separate lexical and syntactic systems