The concepts of “self-tracking” and “the quantified self” have recently begun to emerge in discussions of how best to optimize one’s life. These concepts refer to the practice of gathering data about oneself on a regular basis and then recording and analyzing the data to produce statistics and other data (such as images) relating to one’s bodily functions and everyday habits. Some self-trackers collect data on only one or two dimensions of their lives, and only for a short time. Others may do so for hundreds of phenomena and for long periods.
Via nrip, Lionel Reichardt / le Pharmageek, Tictrac