The book "PhD Dissertation. Writing Methodology, Design Rules, and Procedure for Defense" is an indispensable guide for graduate students and scientists who want to successfully defend their PhD thesis. The authors reveal in detail the methodology for preparing a dissertation, providing clear advice on choosing a topic, formulating the goal and objectives of the research, as well as planning the work. The book draws attention to the importance of observing the rules for the preparation of a candidate's dissertation in accordance with the requirements of the scientific community. The authors explain the minimum standards for the design of the text, including the list of used literature and the obligation to refer to relevant sources. In addition, the book provides comprehensive information on the procedure and procedures for the defense of a candidate's thesis. The authors talk about preparing for the defense, the components of the presentation, as well as how to answer the questions of the commission members. "PhD dissertation. Writing methodology, rules of preparation and defense procedure" is an indispensable reference for everyone who wants to achieve success in scientific activities and obtain an academic degree of candidate of sciences.