This study determines the impact of problem-based learning on a preuniversity geography class. Learning activities include problem analysis, information collection, an examination of concepts, oral presentations, and group summaries in relation to current and perennial geographical issues of local and/or global concern. Assessment "for" learning and assessment "of" learning were done by the teacher, classmates, and students themselves. Results showed that students could analyze problem statements and present their understanding systematically but varied considerably in organization, argument, and quality of thinking. To seek improvements, teachers should become more active facilitators while encouraging students to learn as problem solvers. Teacher training and school-based support are needed for creating a collaborative inquiry-oriented atmosphere in the classroom. (Contains 5 tables.)