1 Subjects: “...; Stichprobe; Instruction in natural science subjects; Primary school science and social studies; Text analysis...”

2 Subjects: “... lecturing; University lecturing; University teaching; Academic sector; University; Natural sciences lessons...”

3 Subjects: “...; Primary school pedagogics; Instruction in natural science subjects; Primary school science and social...”

4 Subjects: “...natural science...”

5 Subjects: “...; Mathematics lessons; Teaching of mathematics; Instruction in natural science subjects; Primary school science...”