One of the fundamental tasks of the curriculum is to enable the learners have essential skills as well as acquire knowledge. Critical thinking, as one of the major thinking skills, is regarded as one of the 21st century skills that are to be covered in the education curriculum. However, the main challenge is how to teach thinking or critical thinking and how to stimulate students to reflect on their own thinking ways. In terms of education system and curriculum, the important point is that critical thinking cannot be transferred from a textbook, rather ignited from the mind. Critical thinking is not only about teaching students how to think but also training their minds to be elastic and active enough to think about, investigate and examine new and old information or facts they learn. This research has a qualitative research design. This study aims to investigate the opinions of primary school teachers with the help of the data obtained by face to face interviews and focus groups. The study group consists of primary school teachers who are willing to participate in this study. The primary school teachers are still teaching at their private and public primary schools in Lebanon. The findings are based on the themes and given under the subtitles.