Self-regulation is the ability to regulate emotions and behaviour. This is an important skill in life and necessary to achieve your goals. When a child attends school, a high level of self...Show moreSelf-regulation is the ability to regulate emotions and behaviour. This is an important skill in life and necessary to achieve your goals. When a child attends school, a high level of self-regulation is necessary. Self-regulation is affected by many different factors, such as school context. Some of these factors are different in twins compared to singletons, since twins are more often compared to each other. It is still unclear how being in the same classroom or not effects the development of self-regulation in twins. Therefore, this study was designed to examine the effect of being in the same classroom on selfregulation in twins. There were 90 participants between the age of 3 and 4, followed for six years at three measurement timepoints. Self-regulation was measured by Dutch versions of caregiver questionnaires, the Children’s Behaviour Questionnaire and the Temperament in Middle Childhood Questionnaire. The long-term effect of being in the same classroom or not on the development of selfregulation and the effect of zygosity were also examined. The results showed a significant increase of self-regulation in twins from T1 to T2, but this was not affected by whether twins were in the same classroom or not. There was neither a significant long-term effect on being in the same classroom or not on self-regulation in twins nor an effect of zygosity. There seemed to be no difference in the development of self-regulation when twins were separated in school and when they were not, but for a broader understanding further research is recommended.Show less
