The study in this paper aims to contribute knowledge about what characterizes STREAM didaktik in preschool based on a theory-informed teaching arrangement in an ULF[i] network. The study is guided by the question: What can characterize STREAM didaktik in preschool with a focus on literac/y/(ies) in what and who/which questions? Theoretically, the study is connected to three main concepts: STREAM, didaktik and literacy. The material consists of 85 documents, totalling 14, 200 words and 2.5 hours of film focusing on planning and conducting teaching in preschool. The knowledge contribution is: 1) STREAM didaktik with literacy(s) in focus appears as a relation between general didaktik and subject didaktik in preschool, 2) STREAM didaktik with literacy(s) in focus can also be seen as a bridge between opening to the unknown and searching for the known in a movement between planned and spontaneous teaching in preschool, and 3) STREAM didaktik with focus on literacy(s) in what and who/which questions can be tried in terms of STREAM actors. [i] ULF är en förkortning av Utbildning, Lärande och Forskning (https://www.ulfavtal.se/ ). Länk till vårt ULF-nätverk https://blogg.mau.se/ulf/2021/01/19/nytt-ulf-natverk-pa-malmo-universitet-didaktisk-modellering-i-forskola/#:~:text=I%20det%20nystartade%20ULF%2Dn%C3%A4tverket,%3A%20Lund%2C%20Staffanstorp%20och%20Vellinge