The book by Gradi Bucha, a recognized expert in the field of object-oriented software development methodology, contains a classic presentation of the analysis and design of complex systems. In the first part of the book, the author explores the essence of the fundamental concepts of OOP (such as `class`, `object`, `inheritance`), analyzes the concepts underlying object-oriented languages and development techniques. The second part contains a detailed description of the notation (known as `Booch notation`), which has long become familiar to thousands of developers around the world. Here the author shares his wealth of experience in organizing the software development process, gives recommendations on selecting a team and planning interim releases. In the third part, the methods outlined earlier are applied to the analysis and design of several applications. Before the reader's eyes, the framework of the corresponding systems is created, and fundamental design decisions are made. The book will be useful to analysts and software developers, teachers and students of higher education institutions. Compared to the first edition, the book has been slightly expanded (as reflected in the title); all examples are given in C++.