Chen of Kang Ho Publishing Co. states that in many primary schools, the preferences of the principal (sometimes influenced by the principal's relationships with publishing companies), determine the textbooks used by the school.
康和的陳寶香也表示，在許多小學，校長對教科書的喜好（有些牽涉到跟出版商的關係），幾乎決定了學校使用什麼教科書。