This type of analysis is the most engaging aspect of GIS. Formulating the right question is the key to identifying the tools and the type of analysis to be used to obtain a meaningful response. Take into consideration that GIS helps you to make informed decisions, but does not decide for you!
Spatial analysis is useful for evaluating the suitability, estimation and forecast, if the interpretation of data is carried out with the necessary competence and experience. Being able to better understand your data should help you make appropriate decisions about your analysis and anticipate how your choices will impact on results.
The use of spatial analysis makes possible to combine information from many different sources. It is also possible to deduce new information by applying a sophisticated set of spatial operators. This vast collection of spatial analysis tools increase your options to have answers to your questions.