Successive bilingual children are often misdiagnosed with regard to Specific Language Impairment (SLI). Currently, no reliable procedures are available that detect a risk for SLI in successive bilingual children. This project aims to find verbal and non-verbal markers that allow identifying successive bilingual children who are at risk for developing SLI. In a longitudinal study we are going to test successive bilingual children in 6 months intervals over a period of one year (3 times). At the starting point children are between 4;0-4;5 years old. Children whose language abilities in both languages permanently stay behind their peers after our last test session at age 5;0-5;5 are likely to be at risk for SLI.