Project-Based Learning and Critical Thinking Skills Among Secondary School Students

Abstract

This study investigates the relationship between project-based learning (PBL) implementation and critical thinking skills development among secondary school students in Finland, a country renowned for its innovative educational approaches. Employing a quasi-experimental design with 380 students from twelve secondary schools across Finland, this research examines how structured project-based learning experiences influence students' analytical reasoning, problem-solving capabilities, and evaluative thinking. Data collection involved pre- and post-intervention critical thinking assessments, classroom observations, student portfolios, and teacher interviews conducted over one academic year. Findings indicate that students engaged in well-designed PBL experiences demonstrated significantly higher gains in critical thinking competencies compared to control groups receiving traditional instruction, with effect sizes ranging from moderate to large across various thinking dimensions. Analysis reveals that successful PBL implementation requires careful scaffolding, explicit critical thinking instruction, authentic problem contexts, and collaborative learning structures. However, challenges emerged regarding assessment validity, time constraints, and teacher preparedness for facilitating complex inquiry processes. This research contributes empirical evidence supporting PBL's effectiveness for developing twenty-first-century thinking skills while identifying critical implementation factors that influence outcomes.