Psychology
Growth Mindset Interventions in Schools: Evidence and Limitations
Quick fact
A major national study in the US (2019) found that a one-hour online growth mindset intervention improved grades by only 0.10 grade points—less than one letter grade for many students, yet still statistically significant.
Why this is interesting
You've probably heard that 'growth mindset' can transform learning. But when scientists tested it on 12,000 students, the results were surprisingly small—so what's actually going on?
Read the full explanation
Understanding Growth Mindset Interventions in Schools: Evidence and Limitations
Let's start with the core idea: a growth mindset is the belief that intelligence and abilities can be developed through effort, learning, and persistence. The opposite is a fixed mindset—the belief that intelligence is static. The theory gained popularity with Carol Dweck's work in the 1980s and 1990s. Schools then began developing interventions—short programs, workshops, or online modules—to teach students this mindset, hoping to boost grades and motivation, especially for struggling students. Think of it like this: if a student believes intelligence is fixed, then a failure suggests they're 'dumb'—so they may give up. If they believe intelligence can grow, a failure is just a signal to try new strategies. Interventions try to shift that belief, often by teaching students that the brain grows with effort and that challenges are opportunities. These interventions vary widely. Some are a few sessions, others are integrated into courses. Most include activities like reading about the brain, writing essays to younger students, or engaging in discussions. The idea is to create a 'mindset change' that then changes study habits and resilience.
A deeper explanation
Under the hood, growth mindset interventions work through a chain: changing beliefs → increasing motivation → changing learning behaviors → improving outcomes. But research shows this chain is fragile. The most robust evidence comes from a large 2019 study (the National Study of Learning Mindsets) which involved 12,000 9th graders across the US. It found an overall effect of about 0.10 GPA points—small, but consistent with a 'treatment effect'. Crucially, it found that the intervention helped most for lower-achieving students (effect ~0.17 GPA) and did not harm high achievers. Yet, other studies have found smaller or null effects. A well-known 2022 meta-analysis (Macnamara & Burgoyne) concluded that interventions produce 'very small' overall effects, especially when self-reports or identical controls are used. They also found evidence of publication bias—small studies with null results are often not published. Theory-wise, the underlying mechanisms are not fully understood: does the intervention change mindset? Sometimes yes, but the change is small and may not persist. Why the mixed results? Context matters: teacher buy-in, school culture, and reinforcement over time. A single lesson may have little effect if the classroom still 'punishes' mistakes. Also, most students already hold a somewhat growth-oriented mindset—the average belief score is above midpoint—so the room for change is limited. Furthermore, the 'mindset' construct itself is often measured by a self-reported scale that may not capture actual beliefs. Despite the limits, the concept remains valuable because it highlights the power of beliefs and the need for rigorous evaluation. It's not that growth mindset is a myth—it's that single, short interventions are not a magic bullet. For policy, the lesson is to avoid hype, rely on evidence, and consider combining mindset interventions with structural changes like better teaching or access to resources.