AFTA is based on the progressive reduction in track length as a function of temperature and time ("fission track annealing"). This reduction in track length is also manifested as a reduction in fission track age. New tracks are produced throughout geological time, as a result of spontaneous fission of uranium impurity atoms within the apatite crystal lattice. In a sample which is heated and then cooled, tracks produced up to the time at which cooling begins will be shortened to a length determined by the maximum paleotemperature, while tracks produced after the onset of cooling will be longer. The proportion of shorter to longer tracks is determined by the time at which cooling began, in relation to the overall duration of the history. The basic process of extracting thermal history solutions from AFTA data involves modelling AFTA parameters through various thermal history solutions, so as to define the range of maximum paleotemperatures and timing of cooling for which predictions are consistent with the measured data. This process requires a detailed knowledge of the kinetics of the annealing process, and the way this depends on apatite composition.... Fission track data is not AFTA. CI Kinetics presentation. Sampling for AFTA. Thermal history interpretation of AFTA data.