This is not just another manual that will challenge you and end up on your bookshelf among other cumbersome works. On the contrary, this second edition describes in detail how to conduct and write a scientific paper according to the standards of international scientific journals. In fact, to maximize the practical role of the volume, entire sections of the text have been replaced, adhering to modern knowledge. Tested in practice, the book meticulously refers to examples and explanations on implementing models through quantitative research and structured questionnaires. Therefore, special emphasis is placed on statistical-quantitative analysis methods, which are accompanied by practical advice and examples using SPSS. Sampling methods are analyzed both theoretically and by describing seven fully developed real-world examples. Finally, special emphasis is placed on the use of structural variables and how they arise from the processes of conceptualization and operationalization.