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In page Annie M.G. Schmidt:

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Schmidt began writing Jip en Janneke while working in Amsterdam at Het Parool. Jip and Janneke are two children who live next to each other, and engaged in short, self-contained adventures every week. Some story lines were based on real adventures involving Schmidt's son Flip and the girl next door.[citation needed] The stories were illustrated by Fiep Westendorp. The first was published 13 September 1952, the last 7 September 1957; a total of eight book collections were published between 1953 and 1960. Jip and Janneke are among the best-known children's characters in the Netherlands—they were listed first on a list of "five typically Dutch phenomena"[1]—and their likeness is marketed on a variety of products sold by the HEMA department stores.[2]