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I think all three cities are up there but at an early stage of implementing there vision. Out of three, I see Chicago as the most clear about its objectives. However, as we have learnt to be very clear about your goal at the start is not necessarily the best approach, as planning is an evolving process. Nevertheless, all three quoted examples are a good example for other cities to follow.With respect to my city, I think I would like to learn from the examples of all three and first of all set a broad vision based on my city's unique major issues after citizen involvement. To achieve this vision, I would like a set a broad list of strategies, which again will be finalized after involving broader consensus of society. But these strategies will be an evolving process, which would be re-visited during the planning and implementation process.

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I think all three cities are up there but at an early stage of implementing there vision. Out of three, I see Chicago as the most clear about its objectives. However, as we have learnt to be very clear about your goal at the start is not necessarily the best approach, as planning is an evolving process. Nevertheless, all three quoted examples are a good example for other cities to follow.With respect to my city, I think I would like to learn from the examples of all three and first of all set a broad vision based on my city's unique major issues after citizen involvement. To achieve this vision, I would like a set a broad list of strategies, which again will be finalized after involving broader consensus of society. But these strategies will be an evolving process, which would be re-visited during the planning and implementation process.

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Global multidisciplinary (engineers, designers, tech specialists, planners) firm Arup appears to be quite active in the smart cities space, having developed master plans and roadmaps for many cities (e.g. Ciudad, Hong Kong, London), helping positioning cities to take advantage of smart city approaches (Scandinavia) and other work on the global market in smart cities. Arup views digital technologies as making smart cities 'more liveable, sustainable and prosperous' and see smart cities as one of the tools for urban development, with people at the heart of the process. The London report, for example, is accessible with clear and practical actions.
Vicki Evans
http://www.arup.com/services/smart_cities

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It seems to me that the most crashproof strategies are presented by Amsterdam and Birmingham. Both of them includes the overall vision, main strategy line, and clear tactic paths. Yes, they are not complete in a way that covers all the aspects of city life. But I believe we should start somewhere — and we can add other things on each milestone.

Dubai and Chicago are great too. But it looks like beautiful vision without any action plan. That's why it's more doubtful for

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VISION TO MAKE DUBAI THE HAPPIEST CITY ON EARTH

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I feel that Amsterdam shows initiatives which have worked and seem probable to use in most cities around the world. I like the environmental sector whereby solar/wind & electric cars as well as shared energy (& tools) is used. The strong connection between people, councils and businesses shows that this can work.
Dubai has also clearly laid out its 6 areas to similarly bring in positive ideas to a dynamic state. Of course this may only focus on a proportion of the population, but hopefully this will only lead to positive development.
I feel that Birmingham and Chicago have good ideas yet I'm not so sure as to what has actually begun. Data driven interaction and education is definitely a plus and hopefully this will be developed.
I also agree that Vienna...above...has many positive plans for the future, especially regarding the developing infrastructure and open data.

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The 3 approaches are slightly different. I think that the Birmingham fits best when you start with citizens, and Dubai it's for a city that has planned from scratch and do not have financial problems. Chicago is a good mix between city government and public entities.

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http://www.citylab.com/tech/2015/02/kids-are-sparking-urban-planning-changes-by-mapping-their-slums/385636/

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Kids in India Are Sparking Urban Planning Changes by Mapping Slums

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Kids in India Are Sparking Urban Planning Changes by Mapping Slums

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Giving a voice to the poor children in the slums of India is an example of bringing Smart City ideas to a large sections of the world population that often gets neglected.
http://www.citylab.com/tech/2015/02/kids-are-sparking-urban-planning-changes-by-mapping-their-slums/385636/

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Curitiba has a strategic plan for "The Future City". Although it doesn't get deep into the smart city concept it brings insights about technology as suport for planning and management.
You can find info (in Portuguese) here: http://www.curitiba2035.org.br/download?arquivo=Curitiba_2030.pdf&edicao=2030

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http://www.stuttgart.de/img/mdb/publ/27286/122129.pdf

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Each of these three cities is looking to play to its strengths.  By working with local groups and companies to attack problems that are pressing, they in theory are increasing the chance of success.  You have interested parties, with things at risk, and city management motivated.

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The vision is to become the city where technology fuels opportunity, inclusion, engagement and innovation.

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Strategies set in these cities are centered around making the lives of citizen better.  They address unemployment, skills gap health inequalities, carbon reduction targets, connecting and integrating infrastructure that ensures easy mobility, the availability of clean energy sources protecting natural resources such as soil, water and air and promoting energy consumption.  Citizen, businesses and government come together to collaborate.

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The thoughts of Birmingham and Chicago are new ideas as we are talking about cities already consolidated for many years but has the advantage of having an open society, it is not the case of Dubai that is a young city that wants to make room in this field But it has the disadvantage of a social class that imposes its principles and is not heterogeneous as the previous ones. I think that Birmingham and Chicago have great results because they bet on it. Amsterdam is a city that is in contact with nature and there is a symbiosis between those who live and the environment and this is an important asset when it comes to developing innovative projects that cost very low and that will be ideal to be able to establish them in other cities

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These three cities have three very differents realities, and their plans are varied too. Some are more efficient from my point of view.
The case of Dubai, for example, shows a quite complete program which works in several areas like the society or the place. Nevertheless, it doesn't tackls any concret actions. So it looks like a not successful project.
However, the other cases are better as far as the different initiatives are concerned. In both cases, proyects about infraestructure or services are explained by the partnership who work in that.
In this way, the first model may seen less limiter but it can be imprecise too. The other method emphasizes the creativity at first.
The case of Amsterdam is very nearby and it get to show different strategies and allow everyone know them and can help in their implementation.

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https://smartcity.wien.gv.at/site/en/