Influence of Problem Based Learning on Lower Secondary Students’ Performance in Chemical Reactions in Nyarugenge District Rwanda
This quasi-experimental study conducted in Nyarugenge District, Rwanda, demonstrates that Problem-Based Learning significantly improves lower secondary students' academic performance in chemical reactions compared to traditional lecture-based instruction.
Original paper licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). This is an AI-generated explanation of the paper below. It is not written or endorsed by the authors. For technical accuracy, refer to the original paper. Read full disclaimer
Chemistry is often the subject that makes students feel most lost. It asks learners to juggle three different ways of seeing the world at once: the things they can see and touch, the invisible particles that make up those things, and the abstract symbols written on a chalkboard to describe how they change. For many teenagers, this mental leap is too high. They end up memorizing rules they do not understand, which leads to confusion and poor grades. This is especially true when they reach the topic of chemical reactions, where substances transform into new materials. In Rwanda, as in many places, the standard way of teaching this subject involves a teacher standing at the front of the room explaining concepts while students listen and take notes. This method, often called the lecture approach, treats learning as a one-way transfer of information. But when the subject is this complex, simply listening is rarely enough to build a deep understanding.
Researchers in the Nyarugenge District of Rwanda decided to test whether a different approach could help students grasp these difficult ideas. They focused on a method called Problem-Based Learning. Instead of starting with a lecture, this method presents students with a real-world problem or a puzzle to solve. The students must work together in groups to figure out what they need to know, research the answers, and apply their findings to solve the problem. The idea is that by actively hunting for the solution, students build the knowledge themselves rather than just receiving it. A team of researchers from the University of Rwanda set out to see if this active, student-led style of teaching would actually improve test scores compared to the traditional lecture style. They worked with 227 students in their second and third years of secondary school, splitting them into two groups to see which method worked better.
The study began by giving all the students a test before any special teaching took place. This was to make sure the two groups started on equal footing. The results showed that both groups knew very little about chemical reactions to begin with, with average scores well below the halfway mark. One group had a slightly higher average than the other, but the difference was not large enough to matter, confirming that both groups were equally unprepared for the topic. This was a crucial step, as it meant that any changes in their performance later on could be blamed on the teaching method, not on one group being naturally smarter than the other.
Over the course of four weeks, the two groups learned the same material but in very different ways. The first group, known as the experimental group, was taught using Problem-Based Learning. In these classes, the students were given challenges related to chemical reactions and had to collaborate to find the answers. The second group, the control group, was taught using the traditional lecture method, where the teacher explained the concepts and the students listened. After the four weeks were over, both groups took the same test again to see what they had learned.
The results of the final test told a clear story. The students who had learned through Problem-Based Learning showed a significant improvement. Their average score on the test rose to nearly 29 points out of 50. In contrast, the students who had been taught with the traditional lecture method saw almost no change, with their average score remaining stuck at roughly 18 points. When the researchers analyzed the numbers, they found that the difference between the two groups was not a fluke or a matter of chance. The group that solved problems together understood the material much better than the group that simply listened to a lecture.
This finding suggests that when students are forced to engage with the material by solving problems, they build a stronger understanding of how chemical reactions work. The traditional method of listening to a teacher did not help them overcome the initial confusion or the difficulty of the subject. The researchers concluded that the active, collaborative nature of Problem-Based Learning helped the students connect the abstract ideas to real situations, leading to better academic performance. Based on these results, the authors recommend that teachers in Rwanda and elsewhere consider shifting away from pure lectures and instead use problem-solving activities to help students master difficult science topics. They suggest that school leaders should support teachers in learning how to run these classes and that curriculum planners should include more real-world problems to make the learning stick.
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