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Freie Universität’s development strategy evolved out of its founding principles, as the university relied on international networks from the very beginning.In 2007 and again in 2012, the university won the status of a University of Excellence in the German government’s Excellence Initiative.Dendrochronologists originally carried out cross-dating by visual inspection; more recently, they have harnessed computers to do the task, applying statistical techniques to assess the matching.To eliminate individual variations in tree-ring growth, dendrochronologists take the smoothed average of the tree-ring widths of multiple tree-samples to build up a ring history, a process termed replication.With this new alliance of three major universities and the medical school Charité – Universitätsmedizin Berlin, this cooperation will be strengthened and supported at the institutional level.

Dendrochronology (or tree-ring dating) is the scientific method of dating tree rings (also called growth rings) to the exact year they were formed in order to analyze atmospheric conditions during different periods in history.During the latter half of the nineteenth century, the scientific study of tree rings and the application of dendrochronology began.In 1859, the German-American Jacob Kuechler (1823–1893) used crossdating to examine oaks (Quercus stellata) in order to study the record of climate in western Texas.Horizontal cross sections cut through the trunk of a tree can reveal growth rings, also referred to as tree rings or annual rings.Growth rings result from new growth in the vascular cambium, a layer of cells near the bark that botanists classify as a lateral meristem; this growth in diameter is known as secondary growth.

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