1) The activity of designing, organizing or preparing for the future lay-out and condition of a city or town. (Source: GEMET/RHW); 2) The activity or process of preparing for the future arrangement and condition of an urban center, particularly the development of its physical lay-out, which would include the construction, reconstruction, conversion, alteration or enlargement of buildings and other structures, and the extension or use of undeveloped land. (Source: GEMET/RHW / ELD)