Abtmct-l/f noise is a nonstatioaary random process suitable for modeling evolutionary or developmental systems. It combines the strong influence of past events on the future and, hence somewhat predictable behavior, with the influence of random events. Nwstntionny autocol&tion functions for l/f nobe ae developed to demonstmte that its present behavior is equrlly CorreLted with both the Rcent md distant past. "he minimtun amount of memory for a system that exhibits l/f noise is shown to be one state wtble per decade of frequency. 'Lhe system condeneerr its pasthistory into the pnsent dues of its state dables, one of which npreaats an average over the most recent l unit oftime,oneforthelwtlOtimeunits,100units,1000,10000,andso on. Ead~ such state variable has m eqd influence on pnsent behavior.
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