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What makes some places succeed while others fail? In evaluating thousands of public spaces around the world, PPS has found that successful ones have four key qualities: they are accessible; people are engaged in activities there; the space is comfortable and has a good image; and finally, it is a sociable place: one where people meet each other and take people when they come to visit. PPS developed The Place Diagram as a tool to help people in judging any place, good or bad:

In a piece called The Beauty of Urban Planning from Space, the Sustainable Cities Collective highlights views from space of uniquely designed street pattern designs in various cities around the world. There are ten examples that illustrate the zenith of urban planning. As attractive as the street patterns are, they highlight the inevitable inability of designers, or anyone else for that matter, to influence much more than small changes in the overall urban form.

Besides its appeal to a longue durée analysis, the topic of urbanism and utopia - and their links, of course - is today rather fashionable, whether one speaks of current exhibitions, critical insights on the idea of a capitalist Utopia, or even indirectly among the latest parliamentary reports.  In this series of three guests posts we will explore the definition of a Post-Utopian Urbanism, on the basis of various readings ranging from Lefebvre to recent writings of Jameson and Rem Koolhaas, and to a great extent indebted to David Harvey's seminal analysis of the links between capitalist transformation and our (post)modern perception of space and time (1989).

"n this series of three guests posts we will explore the definition of a Post-Utopian Urbanism, on the basis of various readings ranging from Lefebvre to recent writings of Jameson and Rem Koolhaas, and to a great extent indebted to David Harvey's seminal analysis of the links between capitalist transformation and our (post)modern perception of space and time (1989)."

On population growth and family planning: Bill Ryerson: Well, you brought up Population Media Center. One of the things that we do - and that is the primary thing we do - is to use a strategy of communications that has turned out, from everything we have been able to measure, to be the most cost-effective strategy for changing behavior with regard to family size and contraceptive use on a per-behavior change basis of any strategy we have found on the planet. And this is the use of long-running serialized dramas, melodramas like soap operas, in which characters gradually evolve from the middle of the road in that society into positive role models for daughter education, delaying marriage and childbearing until adulthood, spacing of children, limiting of family size, and various other health and social goals of each country. And we have now done such programs in forty-five countries. And I can give you a couple of statistics. For example, in northern Nigeria, a program we ran from 2007 to 2009 was listened to by 70% of the population at least weekly. It was a twice a week program. It was clearly a smash hit. And it was a smash hit because it was highly suspenseful and highly entertaining. But it had a storyline dealing with a couple deciding to use family planning, which is almost taboo in northern Nigeria because less than 10% of the people in that region use any modern method of contraception. We had eleven clinics have healthcare workers ask clients what had motivated them to come in for family planning, and 67% percent of them named the program as the motivation.

Public advertising is pollution and it needs to be curbed. So insists a new policy from Barcelona, which will substantially cut back on how much advertising City Hall permits in public places. In a bid to make Barcelona a more attractive, less aesthetically cluttered place, street advertising in the city will be reduced by 20 percent in July 2016.

Getting the right city density - generally expressed in the US as people per square mile or homes per acre - to support sustainable and pleasant living is one of the trickiest problems we face as we address the future of our communities. The typically low densities of suburban sprawl built in the last half of the 20th century, despite their popularity at the time with a considerable share of the market, have been shown by a voluminous body of research to produce unsustainable rates of driving, carbon emissions, pollution. stormwater runoff, and adverse health impacts.

As transport commissioner, Janette Sadik-Khan faced down critics to transform New York with 400 miles of cycling routes, a bike share scheme and the remodelling of Times Square. Any city can do it, she tells Peter Walker

One of the problems I have with a lot of what passes for smart infill development - on the whole, a good thing - is that parks and green space are treated as afterthoughts at best, and frequently ignored altogether.