This comprehensive book, written for readers with interest in discrete-time systems, serves as a good source of information. It presents contemporary outcomes in the area of discrete-time systems, including research work written on the topics of robust control, nonlinear systems and current applications. Although the technical views differ, they all are geared towards targeting updated knowledge gain by the researchers and granting efficient advancements along the systems and control arena. Each topic has comprehensive discourses and suggestions for future analysis by interested investigators.