Imagine that someone has developed a training programme that aims to increase the IQ of young children. With only 4 children enrolled in the programme, an increase of 10 IQ points would be a statistically significant outcome. However, with 25 children enrolled, an increase of 4 IQ points would also be significant, and with 10,000 children even an increase of 0.2 IQ points would be significant. Would you send your child to this training programme? Probably not, as an increase of 0.2 IQ points almost certainly has no practical relevance. What do you learn from this situation? How would you assess the practical relevance of a statistically significant outcome? PS: The coursebook is Evidence-Based Management: How to Use Evidence to Make Better Organizational Decisions by Eric Barends