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New Study Finds a Kindness Curriculum Boosts Grades, Behavior, and Happiness in Kids
A classroom program built entirely around teaching kids to be kind just moved a full letter grade on the trait researchers were tracking, from a C to a B, in one school term. That’s the headline finding from a new randomized controlled trial published this year, and the part that stops most parents mid-scroll isn’t the kindness score itself. It’s everything that improved alongside it: attention, behavior, peer relationships, and math and reading scores. Kindness, it turns out, isn’t just a nice-to-have trait. It looks like a lever that moves a lot of other things at once.
What the Study Actually Found
The trial evaluated a program called Learn Kind, an eight-part kindness curriculum for kindergarten through eighth grade, developed by Oliver Scott Curry, a research affiliate at the University of Oxford, a research associate at the London School of Economics, and chief science officer for the nonprofit Kindness.org. Rather than lecturing kids about being nice, the program treats kindness as something to test and measure, with students acting as “student scientists” who perform acts of kindness and then track the effects on themselves and the people around them.
Researchers randomly assigned 50 teachers, covering more than 1,000 students, to either teach the program in the fall term or wait until spring, a design that lets researchers compare outcomes between a treatment group and a genuine control group rather than relying on before-and-after comparisons alone. Teachers rated their students on kindness, prosocial behavior, emotional regulation, attention, peer relationships, happiness, and academic performance in math and reading, both before the program started and again afterward.
Students in the kindness curriculum group improved across nearly every category measured. Kindness ratings rose by roughly a full letter grade. Students were also rated as happier, better behaved, more attentive, and stronger in their peer relationships than the control group, with modest gains in math and reading scores too. The average effect size across all these outcomes was 0.34, a figure researchers describe as a small-to-moderate effect and one that places the program in roughly the top quarter of school-based social and emotional learning programs when compared against similar interventions. When researchers checked back in three months later, the gains in kindness, happiness, behavior, peer relationships, and academic performance had largely held.
Learn Kind isn’t a small pilot confined to one district. It’s already used by more than 1,000 teachers reaching upward of 100,000 students a year, and has been taught in some form to more than 450,000 students across all 50 states and more than 80 countries over the past four years, according to the program’s own tracking. This trial is the first randomized, controlled look at whether it delivers on what it promises.
What Researchers and Educators Say
The finding fits into a broader, growing body of research on school-based social and emotional learning, or SEL. Recent meta-analyses of SEL programs generally have found small-to-moderate positive effects on prosocial behavior, well-being, attention, behavior, peer relationships, and academic performance, roughly the same list of outcomes this new trial reported. What sets this study apart is the randomized design and the size of the sample, over 1,000 students rated by 50 different teachers, which gives the results more credibility than a single classroom’s before-and-after story.
Curry and his co-authors describe kindness as a skill rather than a fixed trait a child either has or doesn’t. Their published research states that individual differences in kindness are partly genetic but largely shaped by a child’s experiences outside the home, which opens the door to programs like this one having a real, measurable effect. The team’s stated plan is to expand the curriculum into related traits like gratitude, generosity, fairness, and honesty, treating each as its own testable hypothesis rather than a vague value to hope kids pick up on their own.
Not every SEL program produces results this strong, and researchers are careful to note that Learn Kind’s outcomes rank in the upper range of similar programs rather than representing some universal ceiling for what kindness instruction can do. Curriculum quality, teacher training, and how consistently a program gets taught all affect whether a school sees results like these.
What This Means for Parents
Most of the research so far focuses on classrooms, but the underlying idea travels well to home life: kindness responds to practice and structure, not just good intentions or a naturally sweet temperament. A few things from the research and from educators who work in this space translate directly to parenting.
Model it visibly. Kids absorb far more from watching a parent apologize sincerely or help a neighbor than from being told to “be nice” in the abstract. Narrate it out loud when you do something kind so the behavior doesn’t happen invisibly.
Make it concrete and trackable, the same way the study’s classroom version did. A simple family habit, like each person naming one kind thing they did or noticed that day at dinner, mirrors the “student scientist” structure that made the curriculum effective: kindness gets named, noticed, and reinforced rather than assumed. Siblings tend to respond well to this format too. Naming a sibling’s kind act out loud, in front of the sibling who did it, lands harder for a child than a private word from a parent alone.
Connect kindness to how it feels, not just what’s expected. Part of what the curriculum tests is whether helping others makes kids happier, and asking your child how it felt to help a sibling or a classmate, rather than just praising the act itself, reinforces the same internal link the research is built around.
Expect an age range, not a single method. The program spans kindergarten through eighth grade with different approaches for different developmental stages, which is a reminder that what works for a six-year-old, like a visual kindness chart, looks different from what works for a twelve-year-old, who often responds better to a private conversation or a shared family goal.
How This Fits With Earlier Kindness Research
Researchers have known for years that kindness-related traits, including empathy and a willingness to share, show up in children as young as infancy. What’s been less settled is how much of that trait is fixed from birth versus shaped afterward, and whether a structured program can move the needle in a way that lasts beyond the program itself. Earlier meta-analyses of school-based social and emotional learning programs found small-to-moderate benefits across similar categories, well-being, attention, peer relationships, and academic scores, which lines up with what this new trial found. The difference here is the strength of the study design: a randomized, controlled comparison with over 1,000 students is a much stronger basis for a claim like this than a single school’s testimonial or a small pilot group.
The three-month follow-up counts just as much as the initial results. Plenty of classroom interventions show a short-term bump that fades once the novelty wears off. Finding that gains in kindness, happiness, behavior, peer relationships, and academic performance were still measurable three months later suggests the program built something closer to a habit than a temporary mood boost.
What a Kindness Practice Could Look Like Week by Week
Parents who want to borrow the logic of the classroom program without waiting for their child’s school to adopt it can build a simplified version at home. Early in the week, name one specific kind act you noticed your child do, however small, rather than offering generic praise like “good job.” Midweek, ask your child to plan one small kind act they want to try, whether that’s helping a younger sibling with a task or including a classmate who’s often left out. By the end of the week, circle back and ask how it felt, both for your child and for the person on the receiving end. That loop, notice, plan, act, reflect, mirrors the “student scientist” structure the study used, and it takes minutes rather than a full curriculum.
What Schools Are Doing With This Now
Learn Kind is offered free to teachers, which is part of why it reached over 1,000 classrooms without the budget barriers that keep a lot of paid SEL curricula out of public schools. Parents curious whether their child’s school already uses something similar can ask a classroom teacher or school counselor directly. Many districts run some version of social and emotional learning without labeling it clearly on a syllabus or newsletter. For schools not currently running a formal program, this study adds fresh evidence for parents to bring to a PTA meeting or a conversation with an administrator about adopting one, backed by a sample size and a study design strong enough to stand up to scrutiny.
The Bigger Takeaway
Parents have long suspected that kindness and good behavior in the classroom aren’t separate boxes, that a kid who’s struggling with peers or losing focus in class often needs support that has nothing to do with academics directly. This study gives that instinct some real backing: when a school invested specifically in teaching kindness as a skill, attention and academic performance moved too, not just the trait being taught. For a school year that already asks kids to juggle new teachers, new social dynamics, and academic pressure, a program built on the idea that kindness can be practiced, not just hoped for, is a useful reframe for any parent wondering where to put their energy first.