Increasing complexity in engineering projects raises difficult challenges in industry and requires effective tools for correct-by-construction design or design verification. This book addresses the design of such tools for correct-by-construction synthesis of supervisors for systems and specifications represented in the discrete-event framework. Highlighting recent progress in the design of supervisors by structural methods, the book represents a novel contribution to the field. One of the main features of the presentation is the demonstration that structural methods can address a variety of supervisor specifications under diverse supervision settings. The work is self-contained and includes necessary background on Petri nets and supervision. The text requires only basic knowledge of undergraduate-level discrete mathematics. It is accessible to a broad audience of graduate students, researchers, and developers from various engineering fields.