▁department ▁to ▁" map " ▁the ▁forest ▁were ▁given ▁recognition ▁of ▁their ▁e colog ical ▁knowledge ▁and ▁proved ▁that ▁top - down ▁models ▁are ▁not ▁always ▁the ▁most ▁functional ▁or ▁correct . ▁ ▁Roy ▁Ellen ' s ▁article ▁" The ▁Cont ribution ▁of ▁Par aser ian thes ▁( Al b izia ) ▁fal cat aria ▁to ▁S ust ain able ▁Sw idden ▁Management ▁Pract ices ▁among ▁the ▁Bad uy ▁of ▁West ▁Java " ▁published ▁in ▁ 2 0 0 0 , ▁the ▁Bad uy , ▁which ▁maintain ▁their ▁cultural ▁identity ▁through ▁sw idden ▁agricult ure , ▁also ▁understand ▁to ▁maintain ▁their ▁traditional ▁way ▁of ▁life ▁they ▁must ▁integrate ▁c ash ▁cro ps ▁to ▁sust ain ▁themselves . ▁This ▁case ▁is ▁an ▁example ▁of ▁how ▁through ▁a ▁successful ▁collaboration ▁between ▁local ▁and ▁outside ▁parties ▁can ▁bring ▁about ▁solutions ▁to ▁sust ain ability ▁problems . ▁The ▁reason ▁this ▁' hy brid isation ' ▁was ▁successful ▁is ▁because ▁the ▁Bad uy ▁ultimately ▁decided ▁for ▁themselves ▁that ▁the ▁Alb izia ▁was ▁an ▁acceptable ▁addition ▁to ▁their ▁traditional ▁sw idden ▁far ming . ▁This ▁integration ▁was ▁not ▁forced ▁upon ▁or ▁mand ated ▁by ▁the ▁government ▁and ▁the ▁" local ▁population ▁could ▁consider ▁the ▁advantages ▁and ▁dis adv antages ▁of ▁the ▁introduction ▁and ▁make ▁the ▁decision ▁for ▁themselves ▁( E ll en ▁ 2 0 0 0 : 1 4 ). ” ▁ ▁Through ▁these ▁two ▁published ▁works ▁of ▁professor ▁Roy ▁Ellen , ▁it ▁is ▁obvious ▁that ▁he ▁covers ▁a ▁wide ▁array ▁of ▁e colog ical ▁topics ▁as ▁well