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Can a classroom program make kids kinder? new study investigates

NCT ID NCT05891067

Knowledge-focused Sponsor: Utrecht University Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now
This trial is taking on new participants right now.
Not yet recruiting
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing
Running, but no longer taking on new participants.
Completed This study
The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
Not a trial. The treatment can normally be requested outside a study, but is unavailable right now.
Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

First seen Jun 27, 2026 · Last updated Jun 27, 2026

Summary

This study tested a classroom-based program called SterkWerk, designed to promote a prosocial (helpful and cooperative) climate among children in grades 5-8 (ages 8-12). Over 2,300 children participated, and researchers measured changes in prosocial behavior, social skills, and classroom relationships. The goal was to see if the program works better than usual classroom practices.

What this could mean

Our plain-language read of the trial. This is informational only, not medical advice or a prediction.

Active substance
Classroom-based behavioral intervention (SterkWerk)
What this could lead to
If effective, this program could provide schools with a simple way to improve children's social skills and classroom climate.
What could go wrong
This is a completed study, but the intervention is behavioral and effects may vary by school or culture. It does not test a drug or medical treatment.

This is an AI summary of the original study and may miss details. Read our disclaimer.

Study facts

What this study's own registry entry says, in plain language.

Phase

Not a phased trial

Phase numbers describe drug development. The registry uses this when they do not apply, as it does for trials of devices, procedures or behaviour changes, and for observational studies.

Participants

2,337 people

The number who actually took part.

Started

May 2023

Finished

Sep 2025

Lead sponsor

Other sponsor

The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Ages

Children (under 18), adults (18 to 64) and older adults (65 and over)

Sex

Anyone

Healthy volunteers

Accepted

You do not need to have the condition being studied to take part.

Show the full entry requirements

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * Primary school children of grades 5-8 (mostly aged between 8-12 years) * Teachers and school leaders of participating schools (no age limit) Exclusion Criteria: * No exclusion criteria

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Conditions

The condition(s) this trial relates to.

Child Behavior

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

Child behavior

Contacts and locations

Locations

  • Utrecht University

    Utrecht, Utrecht, 3584CS, Netherlands

More trials for these conditions

Other studies related to the condition(s) this trial covers.