For an interesting attempt to measure cause and effect try Mappiness, a project run by the London School of Economics, which offers a phone app that prompts you to record your mood and situation. The Mappiness website says: “We’re particularly interested in how people’s happiness is affected by their local environment — air pollution, noise, green spaces, and so on — which the data from Mappiness will be absolutely great for investigating.” Will it work? With enough people, it might. But there are other problems. We’ve been using happiness and well-being interchangeably. Is that ok? The difference comes out in a sentiment like: “We were happier during the war.” But was our well-being also greater then? 
O projeto Mappiness, idealizado pela London School of Economics, ocupa-se do tema relacionado
ao nível de felicidade das pessoas em tempos de guerra.
à dificuldade de medir o nível de felicidade das pessoas a partir de seu humor.
ao nível de felicidade das pessoas enquanto falam ao celular com seus familiares.
à relação entre o nível de felicidade das pessoas e o ambiente no qual se encontram.
à influência das imagens grafitadas pelas ruas no aumento do nível de felicidade das pessoas.