Microplastics are plastic pieces less than 5 millimeters across, and they are now found in water, food and even air. Teens often hear about microplastics through the media, but that information can be incomplete. Most teaching on the topic is still done by lecture. Which approach actually helps students understand?
The researchers worked with 334 students in grades 10 and 11 at six schools in East Jakarta, Indonesia. Each group received one of three approaches:
- A 30- to 60-minute lecture by the research team, with some interaction
- Small-group discussions led by trained student facilitators using an infographic
- Posters and digital infographics, with little interaction
Students took the same questionnaire on knowledge and attitudes before and after, and 257 students completed both.
The researchers found:
- Students started with a fair amount of knowledge. Before any lesson, most already understood the basics of what microplastics are, where they come from and how they can affect health.
- Peer discussions led to the biggest gains in knowledge. Scores rose most in the groups led by trained classmates. These gains were clearly greater than in the lecture groups.
- Infographics also helped. Students who received posters and digital infographics improved their knowledge too.
- The lecture made little difference. Knowledge in the lecture groups stayed about the same.
- Attitudes did not clearly shift. Attitude scores rose most in the peer groups, but no approach produced a clear change after one short lesson.
What this means for your practice:
- Let students teach students. Train a few students to lead small-group discussions. The authors explain that young people tend to learn well from peers they trust and relate to.
- Give peer leaders something to work from. In this study, student facilitators used a simple infographic to guide the discussion.
- Use visuals in shared spaces. Posters and digital infographics cost little and can reach many students at once.
- Don't rely on a single lecture. If you do lecture, pair it with discussion or other activities that get students talking and thinking.
- Find out what students already know. Many students will arrive with some knowledge from social media or documentaries. Build on what they know and fill in the gaps.
- Plan for the long haul on attitudes. To shift attitudes and habits, the authors recommend repeated sessions, real-life examples, emotional connection and community projects.
- Bring the topic into regular lessons. The authors call for microplastics to become a regular part of school environmental education rather than a one-off event.
The Bottom Line
The researchers tested three short lessons on microplastics with more than 300 students in grades 10 and 11 at six Jakarta schools: a lecture, group discussions led by trained students, and handing out posters and infographics. Students in the peer discussion groups made the biggest gains in knowledge, and these gains were clearly larger than in the lecture groups. Students who received infographics also learned more. Students who heard the lecture showed no real change in knowledge. None of the three approaches clearly changed students' attitudes in the short term, although attitude scores rose most in the peer groups. For educators, the study suggests that letting young people learn from and with each other works better than lecturing, and that shifting attitudes takes more than one session.