Scaffolding during these lessons consisted of questions from the teacher that guided students to think more or to connect prior knowledge with the new context (problem). In addition, measuring voltage and electrical current can be identified as scaffolding that guided students to find solutions to problems. Students were able to reflect on and evaluate their thinking or solution when they encountered a failure. The notes made by the students helped them identify their knowledge, learning processes, and understanding. Therefore, students were able to monitor and evaluate their own understanding and thinking by themselves. This suggests that scaffolding can train students to improve their metacognitive skills. Therefore, we can identify scaffolding as a strong component of the portfolio.