Isn't the point of design to meet project requirements? This might be the most basic competency of all of them. Your client, or you, have a goal for what you want to achieve for a project. Create a design solution that meets that goal. However, within the seeming simplicity of this competency lies the real challenge.
Assessing regulatory design requirements is one of the first things to do when you start a design project. That is why NCARB listed it first.