The general scope of the book covers theoretical trends and practical aspects of soft computing and AI such as decision making under imperfect information, intelligent control, data mining, deep learning, uncertain computation, natural language processing and others. Applications in earth sciences, healthcare, social sciences, engineering, and various fields of economics, business, and industry are considered. This book presents the proceedings of the 12th Conference on Theory and Applications Soft Computing, Computing with Words and Perceptions and Artificial Intelligence, ICSCCW-2024, held in Budva, Montenegro, August 26-27. The book is a useful guide for academics, practitioners, and graduates in fields of soft computing and AI. It allows for increasing of interest in development and applying of these paradigms in various real-life fields.