The rationale for this text arose from a need to establish a forum to publish material on the research and devlopment, use and application of mass appraisal techniques as used in ad valorem property tax systems. The main paradigms covered include various forms of regression (additive, multiplicative, hybrid), base home technique, adaptive estimation procedure, comparable sales analysis, expert systems and artificial neural networks.;Conclusions drawn from the book demonstrate that factors such as : volatility of property markets; availability of property data; presence of cadastres; the expertize of those applying the techniques; and the avilable funding for system development are all relevant in the design and application of systems.;The text attempts to bring together experts and researchers who are linked by the common theme of developing more rigorous, more objective and more cost effective appraisal approaches to the determination of property values.