This is not just another manual that will confuse you and be placed in your library among other difficult works. On the contrary, this second edition describes in detail the process of conducting and writing a scientific paper, according to the standards of international scientific publications. In fact, in order to maximize the usefulness of the volume, entire sections of the text have been replaced, following modern knowledge. Tested in practice, the book refers to the implementation of models through quantitative research and structured questionnaires with meticulous examples and explanations. Therefore, special emphasis is placed on statistical-quantitative analysis methods, which are accompanied by practical advice and the use of examples in SPSS. Sampling methods are analyzed theoretically as well as with the description of seven real examples, fully developed. Finally, special emphasis is placed on the use of structural variables and how they arise from the processes of conceptualization and operationalization.