The data of Long Second were videoed twice a week in a preparatory class of recently immigrated children. The videoing lasted for one school year, from September to May, in a primary school in Helsinki area. The main participants’ mother tongues were Estonian and Russian – representing the largest linguistic minorities in Finland – but also Kurdish, Latvian, Macedonian and Portuguese were spoken in the classroom during the year. The data include also interviews with the main participants and the teachers. There are seven distinctive features in the Long Second data: 1) naturalism 2) longitudinality and density 3) multimodality 4) multipartial and simultaneous communication 5) the age of the participants (7–12) 6) multilingualism for the sake of recent immigration 7) focusing on Estonian and Russian speaking learners of Finnish The corpus will be made available in LAT (https://lat.csc.fi).

2018