Berts ytterligare betraktelser

Berts ytterligare betraktelser (Swedish: Bert's additional contemplations) is a diary novel, written by Anders Jacobsson and Sören Olsson and originally published in 1991, it tells the story of Bert Ljung from 1 September to 31 December during the calendar year he turns 13. The book uses the 1989 almanac following the Gregorian Calendar. As standard, Bert opens the chapters with the words "Hej hej hallå dagboken!" and finishes with "Tack och hej – leverpastej". Bert writes diary for each day during this calendar year, and most notes depicts what happened yesterday.

Originally, the Berts betraktelser trilogy appeared in the radio program Almanackan during 1989, where one program was done each day during one year, which Sören thought was fitting well for a diary. During October 1989 Anders and Sören "sprinted" writing the final stories. When reaching the autumn stories, the writers tried to split up the storywriting, calling it "creative competition", trying to exceed each other with fun and surprise with something unexpected.

When the book was released in 1991, it was one of several books by the same writers. 1991 became both the writers' and the book publishing company's best year, saleswise, and the same year the Advent calendar Sunes jul was a TV success. Anders Jacobsson stated in the year 2000 that the book was his favourite Bert book. According to Sören Olsson it shared the first-place together with Berts bokslut.