Kuijer's earlier series of 5 books. written 1975-78.
The first 2 seemed like a cross between Jip en Janneke stories, and Pippii Longstockings. I wasn't sure I was liking these as much as I had liked the Polleke series.
But then the 3rd book, Op je kop in de prullebak, was just darling. Madelief is in a classroom that has a wonderful teacher with a great sense of humor who does all sorts of unusual things with the class. VERY enjoyable to read.
And the 4th book, Krassen in het tafelblad, about Madelief's grandmother who just died and Madelief's stay with her grandfather, who also has a sense of humor and great humility.
These books are treasures.