The use of synthetic phonics to teach reading in the first language now has official blessing and there is no reason why the same approach can’t deliver similar success when learning other languages.
There is an approach similar to this in Germany called "lesen durch schreiben": they give the child that "possesses" already its phonemes the letter that "mostly" corresponds to that phoneme in the "Anlauttabelle": sound /A/ corrresponds to letter A like in "Apfel". Like a phonetic alphabet represented here through normal letters plus mentioning a few exceptions.
When this is done the child with the help of Anlauttabelle is expected to learn all the corrrespondences on its own and write little texts.
https://www.youtube.com/watch?v=j7Hf1E6qxBE
The results have been so devastating that some Länder have banned the method.
Children write MUTA instead of MUTTER, FATA for Vater, FEANSEA for FERNSEHER etc
https://www.huffingtonpost.de/2017/08/2 ... 09220.html
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https://www.news4teachers.de/2018/01/st ... rttemberg/
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https://www.youtube.com/watch?time_cont ... J9HZjYBJXY
Die "Anlauttabelle" (Serie)
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"Lesen durch Schreiben" (LdS)-Konzept und "Schreib wie du sprichst" (Serie)
https://www.youtube.com/watch?v=ePSjUTLllPU