Phenotypic Evolution, a Synthesis will summarize and synthesize the diverse empirical literature on phenotypic evolution and integrate those findings using the conceptual framework provided by quantitative genetics. The literatures to be summarized deal with quantitative inheritance (including QTL studies), mutation accumulation experiments, phenotypic integration, measurements of selection (including Fst/Qst studies), responses to deliberate selection (laboratory, barnyard and greenhouse), trait evolution on phylogenies (comparative studies), and – finally – trait evolution in the fossil record and on phylogenies in deep evolutionary time. I use evolutionary quantitative genetics as a conceptual framework to integrate all of these results, but I do not attempt a comprehensive treatment of theory in this field. Instead, I introduce and use the additive version of this theory, pioneered especially by Russell Lande, which is based on assumptions of prevalent polygeny, pervasive pleiotropy, Gaussian distribution of mutational effects at individual loci, additive inheritance, weak selection, and persistent configuration of adaptive landscapes. This additive version has the advantage that its implications have been explored all the way from the mutation process to macroevolutionary patterns.