Section 21-101 - Purpose of plan(a) This section applies to: (1) the making of the appropriate general plan;(2) any part, amendment, extension, or addition to the plan;(3) the protection of and the carrying out of the plan; and(4) the exercise of any:(i) planning, zoning, or subdivision control powers in the regional district; and(ii) other powers granted in this title to the Commission or to the Montgomery County Council or the Prince George's County Council.(b) The purpose of the plan is to: (1) guide and accomplish a coordinated, comprehensive, adjusted, and systematic development of the regional district;(2) coordinate and adjust the development of the regional district with public and private development of other parts of the State and of the District of Columbia; and(3) protect and promote the public health, safety, and welfare.