This book summarizes the recent progress in practical analysis for semi-rigid frame design in North America. This encompasses codes, databases, modeling, classification, analysis/design, and design tables and aids. Practical design methods include LRFD procedures, approximate procedures, computer-based procedures and the optimization process.The book can be used as a supplementary steel design textbook for graduate students, as a training book for a short course in steel design for practicing engineers, and as a reference book for consulting firms designing building structures.