The preparation of a good city plan requires skillful handling of details, clear vision into the future, good judgment in deciding what is practicable, and a spirit of fair play in adjusting interests that may appear to conflict. Once formulated, the plan needs to be kept up to date, and its execution is never completed while the city is growing or rebuilding. Placing the general responsibility in the hands of a continuing body of well-informed, influential men is the best means so far devised for securing efficiency in city planning. Carrying out the plan often requires courage on the part of the city government, for free departures from it may result in promoting just such disorder and uncertainty as it is designed to prevent. Its integrity can be assured only by a strong and continuing public opinion, and this is best maintained by having leading men in the community at the head of the work.