Assessment of the effectiveness of inquiry-based learning modules in high school biology for improving scientific reasoning skills

Project Abstract

This study evaluates the effectiveness of inquiry-based learning (IBL) modules implemented in high school biology classrooms to enhance students’ scientific reasoning skills, with a focus on argumentation, evidence evaluation, hypothesis generation, and data interpretation. A quasi-experimental design was employed involving two matched cohorts across four public high schools over a full academic semester. The experimental group engaged with a sequence of IBL modules integrated into the biology curriculum, emphasizing student-driven inquiry, collaborative problem solving, and iterative experimentation, while the control group followed a traditional teacher-centered instructional approach. Data were collected through a mixed-methods approach, including pre- and post-tests of scientific reasoning adapted from established instruments, performance-based assessments on open-ended inquiries, classroom observation protocols, and student interviews to capture metacognitive strategies and epistemic beliefs about science. Quantitative analyses used ANCOVA to compare gains in scientific reasoning scores between groups, controlling for baseline ability, with effect sizes interpreted according to Cohen’s benchmarks. The qualitative component employed thematic analysis of interview transcripts and observational data to triangulate the extent to which IBL practices fostered justification of claims, evaluation of evidence, and iterative revision of models. Results indicate that students exposed to IBL modules demonstrated statistically significant improvements in scientific reasoning compared to the traditional instruction group, with moderate to large effect sizes on tasks requiring interpretation of data, design of controlled experiments, and construction of evidence-based arguments. Subgroup analyses revealed that gains were more pronounced among students with initially lower baseline reasoning levels, suggesting a leveling effect of IBL on diverse learner populations. Observational data showed higher frequencies of student articulation of testable hypotheses, consideration of alternative explanations, and peer feedback in the IBL classrooms. Interviews revealed enhanced awareness of the nature of scientific knowledge, greater reliance on empirical evidence over authority, and increased endorsement of collaborative epistemic practices. However, gains were moderated by factors such as teacher proficiency with guiding inquiry, adequacy of scaffolds, and time allocated for inquiry cycles; classrooms with structured facilitation and clear rubrics yielded more consistent improvements. The study also identified challenges including management of student discourse, assessment alignment with inquiry processes, and ensuring equitable participation. Findings suggest that well-designed IBL modules, when paired with professional development for teachers and robust formative assessment, can substantially strengthen high school students’ scientific reasoning skills, contribute to deeper understanding of biology concepts, and foster dispositions aligned with scientific practices. The research contributes to the literature on biology education by providing empirical evidence of IBL effectiveness in classroom contexts and offers practical recommendations for curriculum designers, teachers, and policymakers aiming to cultivate rigorous scientific thinking in secondary education. Recommendations include incorporating explicit argumentation frameworks, scaffolded inquiry cycles, criterion-based rubrics, and ongoing professional learning communities to sustain and scale IBL implementation.

Project Overview

What This Project Is About

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A plain-language look at how using inquiry-based activities in high school biology may help students think more like scientists. The project tests whether students learn to ask questions, gather evidence, and draw explanations more effectively when they explore biology topics through guided investigations rather than just reading and memorizing facts.

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The Problem It Addresses

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Many biology classes rely on teacher-centered lectures that focus on memorizing terms. This often leaves students with limited ability to reason scientifically. The project investigates whether inquiry-based learning can improve students’ abilities to explain natural phenomena with evidence and reasoning.

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Objectives of the Project

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1. Determine if inquiry-based modules improve scientific reasoning scores compared to traditional lessons.
2. Identify which components of inquiry activities (questioning, data collection, reasoning) contribute most to improvement.
3. Explore teachers’ experiences and challenges when implementing inquiry-based modules.

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What You Will Do Step by Step

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1) Review existing literature on inquiry-based learning in secondary biology. 2) Design or select inquiry modules aligned with the curriculum. 3) Recruit classes and obtain consent. 4) Administer pre-tests on scientific reasoning. 5) Implement modules over a defined period. 6) Collect data through observations, student work, and post-tests. 7) Analyze results to compare with control groups. 8) Discuss findings and implications for teaching practice.

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Expected Outcome

We expect to see improved scientific reasoning among students exposed to inquiry-based modules, with clearer links between questioning, evidence gathering, and explanation. The project aims to provide practical guidance for teachers and highlight areas where professional development is needed.