The sabermetrics statistic is also a component other baseball statistics, including the Zone Rating and Revised Zone Rating (RZR) measures of a baseball player's defensive performance. It was developed by sports statistician John Dewan in the 1980s, and then enhanced by him in 2006.[2][6]
OOZ reflects the number of plays a fielder makes on balls that were hit outside his "zone".[6][7] A player's "zone", for purposes of the definition, is considered those parts of the field in which on average a fielder is able to convert half of his chances into outs.[7]