Recruitment
CDI
To recruit students, lectures were held at 12 schools, both ordinary schools, special schools, and schools with reinforced departments. The lectures were held in the period August to December 2022. The lectures emphasized informing about the reading program and the reading material “Reading for All” and about implementation and criteria for the reading intervention. Teachers, who had students within the criteria, registered themselves on an interest list, which the headteacher at the school passed on to the researcher. All the teachers were sent information letters and consent forms which they in turn sent to the parents, and all parents can contact the researchers by phone or email at any point in time during and after the trial. The teachers received their own consent forms. The principals at the respective schools collected all the consent forms and put them in sealed envelopes. They were then collected by the researcher and placed in a locked filing cabinet. The teachers who participate in the study will not be linked to the individual student, which help to strengthen the anonymity of the participants. The teachers and parents were asked to fill in the MacArthur-Bates Communicative Development Inventories (CDI) to document the individual student’s communicative competence. In February 2023, the teachers received training regarding the assessments and material. Baseline started in week 10 of March for all students.