pbL

PBL is an umbrella term for two related instructional approaches that emphasize active, student-centered learning through real-world tasks. In problem-based learning, learners work collaboratively to investigate and resolve authentic problems, with a facilitator guiding inquiry, data gathering, and reflection. In project-based learning, students plan, execute, and present extended projects that typically culminate in a public product or performance and require the integration of knowledge across subjects.

Origins and development: Problem-based learning emerged in the 1960s at medical schools such as McMaster University, shaped by Barrows and Tamblyn, as a method to induce clinical reasoning through problem scenarios. Project-based learning traces its roots to the Project Method advocated by Kilpatrick in the early 20th century and later gained widespread adoption in K-12 and higher education as a means to foster authentic learning and skill development.

Key features: student agency and collaboration; teacher as facilitator rather than lecturer; authentic, complex tasks; scaffolding and clear milestones; ongoing assessment and feedback; emphasis on inquiry, information literacy, communication, and self-regulation.

Implementation and assessment: Both approaches typically require careful design around learning goals, a clear product or outcome, and a plan for managing time and resources. Assessment mixes performance tasks, rubrics, reflective journals, peer assessment, and portfolios. Evidence suggests benefits for engagement, retention, problem-solving, and transferable skills, but effects vary by context and practitioner.

Challenges: PBL can demand substantial time and resources, requires professional development, and risks gaps in content coverage if not well aligned with standards. Equity concerns, access to materials, and assessment validity are common considerations. When well designed, PBL is used across disciplines in schools and universities worldwide to promote interdisciplinary learning and preparation for real-world tasks.