Data mining involves six common classes of tasks:<ref name="Fayyad">{{cite web |last1=Fayyad |first1=Usama |authorlink1=Usama Fayyad |last2=Piatetsky-Shapiro |first2=Gregory|authorlink2=Gregory Piatetsky-Shapiro |last3=Smyth |first3=Padhraic |title=From Data Mining to Knowledge Discovery in Databases |year=1996 |url=http://www.kdnuggets.com/gpspubs/aimag-kdd-overview-1996-Fayyad.pdf |accessdate = 17 December 2008 }}</ref> | Data mining involves six common classes of tasks:<ref name="Fayyad">{{cite web |last1=Fayyad |first1=Usama |authorlink1=Usama Fayyad |last2=Piatetsky-Shapiro |first2=Gregory|authorlink2=Gregory Piatetsky-Shapiro |last3=Smyth |first3=Padhraic |title=From Data Mining to Knowledge Discovery in Databases |year=1996 |url=http://www.kdnuggets.com/gpspubs/aimag-kdd-overview-1996-Fayyad.pdf |accessdate = 17 December 2008 }}</ref> |