Article outline

• 6.1What’s in this chapter
• 6.2The Discontinuity Model
• 6.3The shift between statistical and grammatical learning is ordered, but not gradual
• 6.4SLA facit saltus (takes a leap)
• 6.5SL triggers GL in SLA
• 6.6The discontinuous acquisition of double auxiliary predicates by L2 Italian learners
• 6.7SL precedes GL in SLA
• 6.8Two predictions for the learnability of L2 morphosyntax
• 6.9The intra-language
• 6.10The study of L2 intra-language with ΔP
• 6.11ΔP longitudinal scores in individual learner data
• 6.12To sum up