If you are interested in thinking beyond hydrological models, 'Integrated Modelling and Assessment Systems' or IMAS is the book for you. In this well-researched guide, the author unravels the contemporary and relevant research agenda in climate change and water resources issues in southern African region. This book explores the integrated assessment framework in details, describing: 1) the methods of detection of climate change and variability; 2) the link between El-Nino/ENSO and river flow variability; 3) the methods of construction of climate change scenarios and GCM simulations; 4) weather generation and dissagregation; 5) GIS-based hydrological model development; 6) impact assessment and evaluation; 7) best practices in climate change adaptation. The book also examines the climate change adaptation measures and capacity strategies considering the water-development nexus in Africa. The book finally illustrates how IMAS is integrated as a user-friendly suite of standalone programs in its three major sub-systems for variability assessment, hydrological modelling, and impact assessment and evaluation. Each subsystem is discussed in detail in systematically organized 12 chapters.