Learning critical thinking skills are the goal of educational systems so the term "critical thinking" (CT) is frequently found in educational policy documents. Despite this frequency, however, precise understandings among teachers of what CT really means do not exit. The present study is designed to answer the following question. We can classify critical thinking concept in a conceptual framework. A qualitative content analysis with deductive categorization was used to classify critical thinking concept in a conceptual framework. The research field (statistical population) included all available digital and written sources related to critical thinking. The Research sample was a purposeful homogeneous sample. It is used to describe the sample that includes information based on the qualitative research goals. The results showed that critical thinking concept could be investigated in fields of both psychology and philosophy. While philosophers emphasis on the nature and quality of critical thinking, psychologists focus on cognitive process and components used to investigate the practical problems. So philosophers emphasize critical thinking attitudes while psychologists focus on critical thinking skills.