This study investigates the effects of schemata in enhancing critical thinking skills during Problem based learning task. This is because many educated students are not capable to "think out of the box". In addition, they are also not able to use their critical thinking in writing and speaking. Therefore, the purpose of this research is to investigate whether ESL learners' content schemata and formal schemata enhance their critical thinking skills such as identifying problems, causes, effects and suggesting solutions during Problem based learning. Purposive sampling was conducted on a group of 6 respondents from Form 2 in a rural secondary school, in Perak. This research is an ethnographic research using the Vignettes technique. Hence, the research instruments include the interview, writing task, and reading comprehension test. Data was analyzed using constant comparison method. The findings of this research revealed that, both content schemata and formal schemata enhanced E.....

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