This book explains the importance to acquire complex problem-solving in today's job environment. The book describes how to use five problem-centered methods to design training for real-world complex problem-solving skills. The book briefly describes the five methods in the context of the complex problem-solving skills - Problem-based learning (PBL), Project-based learning, Scenario-based learning (SBL), Case-based learning method (CBL), and Simulation-based learning. The book also specifies six research-based guidelines, and how training experts can design a training curriculum that ensures acquiring and accelerating complex problem-solving skills in any complex domain.