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Erp ImplementProject ImplementationERP implement has two general approaches. One is the big band approach; the other is a phased-in approach. [a][b]Recently, managers have a big discuss which one is better. There are some advantage and disadvantage of this two methods.[c][d][e][f][g][h][i][j]The Big BangPhased-inAdvantageDon’t need temporary interfaces.Don’t need much timeLess costsLess riskEasier to manage multi-site and multi-business unit implementationsLess.