Bibliographical note

Funding Information:
The data were collected as part of the project E-LANE, which was funded by the German Federal Ministry of Education and Research. 1 1 We randomly selected a sample of formal online PD activities that had been offered to teachers from April to October 2021 in two large federal states in Germany. All participants in the selected online PD activities received a written invitation to take part in the survey four to six weeks after the online PD took place. We selected this time period because we were interested in learning about the changes that teachers made in their classrooms after completing the online PD. This online survey was conducted using the platform Unipark by Tivian Xi GmbH. A total of N = 387 teachers responded to the invitation and participated in our study (Brandenburg: N = 280, Schleswig-Holstein: N = 107). The teachers in the sample (81% female) worked in primary schools (41%) and secondary schools (59%) with mean teaching experience of 14 years (SD = 11.55). At the time of the survey, teachers report to have participated in M = 11.75 online PD activities (SD = 13.12) since the outbreak of the COVID-19 pandemic in March 2020.

Funding Information:
We have no conflicts of interest to disclose, This work is supported by the Federal Ministry of Education and Research , Germany, through the Digitalisation in Education program, Award 01JD1825A-B . The views contained in this article are those of the authors, and not their institutions or the Federal Ministry of Education and Research, Germany.

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