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. 2023 Jan 23:1–47. Online ahead of print. doi: 10.1007/s10639-022-11515-5

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© The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature 2023, Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.

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Fig. 15 — Results of a simulating of decreasing attendance by a given factor in additional dropouts. Note that factor a zero factor conduces to repetition, but not necessarily to dropout