From Denmark’s point of view, TIMSS 2015 are all about the assessment of fourth-grade pupils. Other countries chose to participate with eighth-grade pupils or pupils from both grades. Approximately 250 schools in Denmark were invited to participate in TIMSS 2015.

In Denmark, TIMSS 2015 concentrates on fourth-grade pupils. The pupils in this grade are evaluated in terms of their school lives. At this critical age their reading skills should be so good that demands can be made regarding their understanding of mathematics and science. An understanding that may have a vital impact on their subsequent interests and skills.
 
TIMSS includes all the pupils in a class, enabling the study to use questionnaires to evaluate the educational meaning of the term “class” all the way from studies of relations between classmates to the significance of the teachers.