This comprehensive approach that covers everything from Economy to Accessibility is necessary since workers, residents, and tourists will also have "needs" that go beyond a single category.
The last step consists in combining the scores for each function to generate a comprehensive score, providing a broad look at what makes cities globally "powerful". The GPCI evaluates this power by using data representing 70 carefully selected indicators across 6 functions, which are then indexed into indicator groups to create a function-specific ranking. How then do we measure a city's influence? Cities project their influence, or "power" as the GPCI terms it, by connecting to the world and establishing themselves as an attractive place to work, inhabit, and visit. Indices like the Mori Memorial Foundation's Global Power City Index (GPCI), which offers a comprehensive look at 44 global cities across several categories, aim to achieve this goal. Despite these differences, indices and benchmarks can be a useful tool in not only comparing between cities, but also allowing cities to analyze their own results and set policies for the future. A company setting up operations in Paris will likely have a very different experience from one opening an office in Dubai, whether it concerns dealing with regulations or finding human resources. While major global cities may share many broad similarities such as population size, economic structure, and public transportation options, it can still be difficult to compare their "influence" or "power" due to variations seen at the micro-level.
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