Design controls are very essential and useful as others have mentioned. They have listed what they are and their benefits, to avoid repetition, I would like to shift the discussion to a key challenge to design control. The process of implementing the design takes a great deal of time. This fact makes companies feel the frustration of the process which sometimes lead to discourage. Some companies when the process becomes heavy, they start following the regulation instead of understanding its intent and main purpose. Therefore, their rush and concentration on following the process makes them oversee the benefits mentioned earlier in this discussion.