Textbooks don't have a particular validity / 5 years of time for a textbook

In reply to the critics about textbooks, Hojjat-ol Islam Moheyeddin Bahram Mohammadian said in his interview with FARS: Many may criticise the textbooks, but what matters is the bases and standards on which the contents of textbooks are prepared. We believe that it's through scientific standards that we may achieve an educational program and "Statement of Fundamental changes".

Of course, every textbook may have some faults or weaknesses. That's why we have a trial at the first year of publication. After that the book will be in circuit for a period of four years and there would be a revision at the fifth.

He added: Textbooks don't have a particular validity and are subject to social, cultural, political and other requirements of time and community.