Kt-jets and jet structure and fragmentation at the Tevatron

$k⊥$ algorithms are now used by both $DO/$ and CDF to study jets. A preliminary study of jet structure for data taken by $DO/$ and CDF during run I (92–95) is presented. $DO/$ has measured the jet mass as a function of jet $pT.$ The CDF measurement of inclusive charged particle momentum distributions is in agreement with the Modified Leading Log Approximation (MLLA).