What changed in planning
Planning in the twentieth century was often about large, top-down schemes: separating uses, building highways, clearing districts judged to be run down and designing for car travel. Many of those approaches had lasting costs, and in recent decades practice has moved in several directions. This article surveys the approaches that have taken hold since then and sorts them roughly by how well established they are. The sorting is a judgment, and reasonable planners disagree about some of it.
The term best practice deserves a note of caution. A practice that works well in one city may not transfer to another with different laws, climate, culture or market conditions. Think of best practices as tested starting points, not guarantees.
Better established
Public participation. Involving residents in planning is now a standard expectation in many countries, often required by law. The idea is that people who live with the results should have a voice. Done well, it improves projects and builds trust; done poorly, it becomes a box-checking exercise that frustrates everyone. Community participation takes real effort to reach beyond those who already attend meetings.
Mixed uses and walkability. Moving away from strict separation of homes, shops and workplaces toward more varied neighborhoods is now widely accepted in planning thinking. The associated aim of making daily trips possible on foot is supported by long experience in older city districts. The details, such as how much mixing a market will support, vary.
Transit and land use together. Coordinating development with transit service, rather than treating them separately, is well established as a principle. Actual results depend on service quality and funding.
Protecting and reusing older buildings. The recognition that existing structures have value, economically and culturally, has become mainstream. Adaptive reuse is now a common approach.
Considering hazards and climate. Taking flood, heat and other risks into account in land use decisions has moved from a niche concern to routine practice in many places, though the strength of rules varies widely.
Managing parking and street space deliberately. Reexamining how much parking is required and how street space is allocated has become a standard topic, discussed under parking minimums and road diets.
Established, but evidence is mixed
Density and infill. Encouraging more homes in existing urban areas is a mainstream goal for reasons of land conservation and service efficiency. Results depend on design quality, infrastructure capacity and community acceptance. The debate over density is legitimate and not settled.
Form-based codes. These rules, which regulate building form more than use, have spread in some places. Their performance depends on how well they are written and administered.
Green infrastructure. Using landscaping and natural systems to manage stormwater and heat has strong appeal and a growing track record. Performance varies with design and upkeep, and some claims about benefits have been overstated.
Placemaking and tactical projects. Low-cost, temporary changes to test street and plaza designs are widely used. They can be informative, but a successful pop-up does not guarantee a permanent solution will work, and critics note that they can favor areas that already have strong organizations.
Equity-focused planning. Many plans now include goals related to fairness and displacement. The commitment is real in many places, though translating it into measurable outcomes has proven hard. The tools are still being developed.
More hype than evidence
Plans that depend on a single technology. Visions that assume a particular technology will transform cities, such as self-driving vehicles or flying taxis, have often proven premature. It is sensible to treat them as possibilities, not plan foundations.
Ranking-based urbanism. City rankings and branding such as most livable or most innovative can attract attention but offer limited guidance for practice. They often rely on selected measures and may reflect the interests of those who produce them.
Creative class and similar formulas. Strategies that promise to attract a particular group of workers by providing certain amenities were enthusiastically adopted but have not reliably delivered, and critics have raised concerns about their effects on affordability.
Flagship projects as cure-alls. A single stadium, convention center or signature building is sometimes presented as a catalyst for regeneration. Evidence on such projects’ broader economic effects is mixed, and they can divert resources from basics.
Dashboards for their own sake. Collecting indicators is useful only if they are used. Otherwise they are decorative, a point explored under planning indicators.
How to evaluate a practice
- Is there a track record in comparable places? Look at similar climate, size, laws and income levels.
- What does it cost, and who pays? Include ongoing costs.
- Who benefits and who bears the risks?
- Does it require changes in rules or institutions? Some practices fail because the legal setting does not support them.
- Can it be tested and adjusted? Reversible steps are less risky.
- How will success be measured? Without measures, it is hard to tell.
Process matters as much as content
An observation that comes up often in planning research and practice is that how a plan is made and carried out matters nearly as much as what it contains. Plans need funding, staff, political support and follow-through. Comprehensive plans that sit on a shelf accomplish little; a modest plan that is implemented can change a lot. Streamlined permit approvals are a mundane example: delays and uncertainty can defeat good ideas.
Looking ahead with humility
Planning has always involved predicting the future with imperfect information. Good practice in this century leans toward flexibility, honesty about uncertainty, participation, attention to fairness and a preference for tested methods. It treats fashionable ideas as hypotheses and learns from results, including failures. No formula replaces local knowledge, and outcomes will always depend on specific places and people.