Hamzah & Yeang is a Kuala-Lumpur based architectural office famous for their development of the 'bioclimatic' skyscraper typology. The recently completed UMNO Tower in Penang marks a culmination of a long series of buildings based on a continuous process of research, design and development aimed at producing innovatory tall buildings that make maximum use of natural lighting and ventilation and that are commercially successful.This book provides complete documentation of a remarkable building, and the processes and research that produced it. Leon van Schaik's critical introduction provides the background to the firm's work and assesses the building's significance. Phil Jones from the University of Cardiff explains the theory behind the building's energy systems, and Ken Yeang describes his firm's methodology, making this book both a record of a building and of the processes that produced it.