METHODOLOGY OF THE “I HEARD – I SAW - I DID” PRINCIPLE OF THE PEDAGOGICAL EDUCATION INNOVATION CLUSTER (CHIRCHIQ MODEL) IN TEACHING NATURAL SCIENCES. ReFocus [Internet]. 2022 Oct. 5 [cited 2026 Sep. 12];1(1):15-22. Available from: https://refocus.uz/index.php/rf/article/view/1020