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Published online by Cambridge University Press: 09 March 2010
Galaxies are complex non-linear systems, evolving on all time-scales. Isolating whatever set of physical processes was important at each major phase of their evolution requires artefacts which resolve the timescales of dominant physical processes. These are the chemical elements, and stellar kinematics. I consider what surveys are required to make progress in Galaxy evolution mapping, in the era of Gaia.