This course articulates theoretical frameworks produced by sociology and their application in studies, analysis and intervention in social reality in order to understand the social changes in modern societies. It will be done a brief contextualization of sociology as a discipline (themes, objectives, distinction between social problems and sociological problems and ethical issues of the practical exercise) and the outline of a project in the sense of sociological imagination suggested by Wright Mills, request by relevant systemic issues. Several perspectives will be presented about the dynamic relationship between theoretical knowledge and knowledge practical and methodological to do a reflection and discussion of issues arising from the practical exercise (e.g. the outline of an object of study, the diagnose and plan of an research, options methodological and data collection procedures). The dimensions of the professional activities of sociologists and the deontological code of ethics, the professional opportunities and the role of national and international professional associations, will also be focused in this course.