Mo. Rev. Stat. § 89.350: Plan, prepared how — purposes.

In the preparation of the city plan, the commission shall make careful and comprehensive surveys and studies of the existing conditions and probable future growth of the municipality. The plan shall be made with the general purpose of guiding and accomplishing a coordinated development of the municipality which will, in accordance with existing and future needs, best promote the general welfare, as well as efficiency and economy in the process of development.