The book presents a qualitative intervention study that investigates the hypothetically inferable effects of a specific form-related approach to language teaching on the language learning processes of pupils in class 4 of a Berlin primary school who are learning German as a second language. Working from a theoretical perspective, current positions taken by research on language teaching and learning and on second language acquisition for the subject of German as a second language are specified and then brought into sharper focus with reference to school-relevant concepts. The research subject is focused on local prepositional phrases in the context of oral accounts and interactions. The transcriptions serve as basis for investigating the following questions: Does a cognitively stimulating, form-related form of language teaching affect the children's language production? After the teaching sequence has been carried out, can other signs of language awareness be identified as compared to before the sequence? Are changes apparent with regard to declination, syntax, semantics or in the area of discourse? Which learning-specific and didactic insights can be derived from the study?