The purpose of hitting the hand board with a ruler is: small punishment and big warning. Beating the hand board with a ruler can make children remember for a long time. Although it hurts to use rattan, it will be unethical to use it to beat children, but it will not play a disciplinary role. So there is no ruler that can be replaced by wooden strips.

Handboards are usually needed for newly developed or designed products. Handboard is the first step to verify the feasibility of the product, and it is also the most direct and effective method to find the defects, deficiencies and shortcomings of the designed product, so as to improve the defects in a targeted manner until the defects can not be found from a single handboard.