文档介绍：CostandScheduleManagement52June 2002? LMJoseph98Importance of Earned Value?Attempts to measure WORK PLISHED?Used to track cost and schedule targets (two ofthe triple constraints)?Key is variance analysis?Advantage: works simultaneously with cost andscheduleJune 2002? LMJoseph99Simple ExampleEX A M P L E S C H ED U L E(4 0 h r s/ w k )($ 2 0 / h r )= $ 8 0 0 / w kT a sk A(1 0 0 h r s/ w k )($ 3 0 / h r )= $ 3 0 0 0 / w kT a sk B(6 0 h r s/ w k )($ 4 0 / h r )= $ 2 4 0 0 / w kT a sk CW e e k l y S p e n d i n g 800 3,800 6,200 5,400 5,400 2,400 2,400 2,400 C u m u l a ti v e S p e n d i n g 800 4,600 10,800 16,200 21,600 24,000 26,400 28,800 CostandScheduleManagement53June 2002? LMJoseph100Simple Example (Cont’d)C u l u l a t i v e S p e n d i n g-5 , 0 0 01 0 , 0 0 01 5 , 0 0 02 0 , 0 0 02 5 , 0 0 03 0 , 0 0 03 5 , 0 0 012345678W o r k i n g T i m e ( w e e k s)Cumulative SpendingJune 2002? LMJoseph101Basic Terms?BCWS (Budgeted Cost of Work Scheduled): thetarget or plan being followed?BCWP (Budgeted Cost of Work Performed): thework that has been plished?ACWP (Actual Cost of Work Performed ): amountof money actually spent in a given period?CV (Cost Variance): deviation from budget?SV (Schedule Variance): planned minus actualwork performedCostandScheduleManagement54June 2002? LMJoseph102Relationships?Cost Variance = BCWP - ACWP?Schedule Variance = BCWP-BCWSJune 2002? LMJoseph103Example?Assume Task A has been worked for 1 week?Person plete only 80% of workBCWP = x BCWS = x $800 = $640?Assume that worker is paid $22/hr and worked 40hoursACWP = $22 x 40 = $880?Then:CV = BCWP - ACWP = $640 - $880 = -$240SV = BCWP - BCWS = $640 - $800 = -$160CostandScheduleManagement55Earned Value CurvesTIMEEXPENSESB CW SACWPB C WPTODAYsvcvOVERRUNSLIPPAGEEACBACJune 2002? LMJoseph105Determining plete?Biggest weakness with earned value?Some adopt 50/50 rule (credit 50% when taskstarts and the remainder when it concludes)?Variations: 0/100