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This is a Observational study (also classified as: Human Clinical Trial).

Development of Problem-Based Learning E-LKPD to Improve Mathematical Prob-lem-Solving Ability and Self-Confidence of High School Students on Quadratic Equations

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Problem-based learning e-LKPD significantly improved students' mathematical problem-solving skills and self-confidence.
The assessment of e-LKPD indicated strong validity, practicality, and effectiveness in high school settings.
ADDIE model was employed in developing and evaluating the educational tools for quadratic equations.
Quantitative results showed significant improvements in problem-solving ability and self-confidence among students, with N-Gain results of 0.65 and 0.49 respectively.

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Research and development on e-LKPD improved problem-solving and self-confidence in high school students, suggesting effective learning strategies.

Lestari et al. (2025) studied this question.

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Research and development on e-LKPD improved problem-solving and self-confidence in high school students, suggesting effective learning strategies.