In any project, <em>the budget must be preliminary and subject to changes</em>, the reason is that in the execution of the project, can appear so many inconvenient that has an additional cost and the executor or builder can not take over all the responsibility (overall in-state projects), in some projects <em>the contractor could increase the cost in a 30% of the total cost of the project by this reason</em>.
The early sociologists that laid the foundations for the discipline of sociology would be : - Emile Durkheim, - Saint simon - Max Weber - C Wright Mills - Karl Max