
Dr Justin Coulson's Happy Families Growth Mindsets & Academic Improvement
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Feb 11, 2026 They examine a major review that found growth mindset interventions yield tiny or no academic gains. They explain effect sizes and why real classrooms complicate controlled trials. They discuss how language, belief and persistence still motivate many children. They weigh risks, practical classroom implications and simple parenting tips for encouraging effort and exploration.
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Mindset Defined: Intelligence Can Grow
- Growth mindset frames intelligence as improvable rather than fixed and uses the word "yet" to emphasise potential.
- Justin Coulson explains the core idea: you can build intelligence like a muscle through effort.
High-Quality Trials Show Tiny Effects
- A large 2025 review of 24 randomized trials found effect sizes near zero for academic outcomes.
- Justin highlights that the highest-quality studies showed null or very small impacts on grades.
Teacher's Bold Claim, Student's C−
- Kylie recounts a teacher claiming any student could get an A in maths while she still earned a C−.
- The example shows belief from others doesn't always produce changed outcomes for every student.



