most of us have. And that's why most of us like to know about the place before we go there. One thing we can do is read a good guide book. Another is to look at a new survey conducted by William Mercer, One of the world's largest Human Resources consultancies.Mercer decided to judge some of the world great cities. They produced their results by giving mark for various criteria . These included political, economic and social environment, healthcare, education provision, recreation and transport infrastructure.