formula memorization trick cv=ev-ac sv=ev-pv cpi=ev/ac spi=ev/pv eac=bac/cpi etc=eac-ac vac=bac-eac...
TRANSCRIPT
Formula Memorization TrickFormula Memorization Trick
CV = EV - AC
SV = EV - PV
CPI = EV / AC
SPI = EV / PV
EAC = BAC / CPI
ETC = EAC - AC
VAC = BAC - EAC
When memorizing theformulas I have found it best to look for patterns. When I see the correct pattern I know the formula is correct.AC = ACWPPV = BCWSEV = BCWP
Formula Memorization TrickFormula Memorization Trick
Ok lets build this. First is to see the pattern of 2 subtractions, 3 divides, 2 subtractions
CV = EV - AC
SV = EV - PV
CPI = EV / AC
SPI = EV / PV
EAC = BAC / CPI
ETC = EAC - AC
VAC = BAC - EAC
Formula Memorization TrickFormula Memorization Trick
Next see the pattern of Variance and Index. Cost, Schedule and Cost, Schedule.
CV = EV - AC
SV = EV - PV
CPI = EV / AC
SPI = EV / PV
EAC = BAC / CPI
ETC = EAC - AC
VAC = BAC - EAC
Formula Memorization TrickFormula Memorization Trick
Next see the pattern of Earned Value (EV). This used to be BCWP.
CV = EV - AC
SV = EV - PV
CPI = EV / AC
SPI = EV / PV
EAC = BAC / CPI
ETC = EAC - AC
VAC = BAC - EAC
Formula Memorization TrickFormula Memorization Trick
Next see the pattern of Actual Cost (AC) and Planned Value (PV) and how they alternate. Skip a line and its AC again.
CV = EV - AC
SV = EV - PV
CPI = EV / AC
SPI = EV / PV
EAC = BAC / CPI
ETC = EAC - AC
VAC = BAC - EAC
Formula Memorization TrickFormula Memorization Trick
Next see the pattern of Estimated at Completion (EAC).As well as Budget at Completion (BAC)
CV = EV - AC
SV = EV - PV
CPI = EV / AC
SPI = EV / PV
EAC = BAC / CPI
ETC = EAC - AC
VAC = BAC - EAC
Formula Memorization TrickFormula Memorization Trick
Not much left. Notice that CPI is divisor of EAC so find CPI skip a line and place it at the end of EAC formula.
CV = EV - AC
SV = EV - PV
CPI = EV / AC
SPI = EV / PV
EAC = BAC / CPI
ETC = EAC - AC
VAC = BAC - EAC
ETC and VAC don’t really match to anything, you just have to know where they go.
Formula Memorization TrickFormula Memorization Trick
This may look confusing but it worked great for me and I have had others tell me it worked for them as well.
CV = EV - AC
SV = EV - PV
CPI = EV / AC
SPI = EV / PV
EAC = BAC / CPI
ETC = EAC - AC
VAC = BAC - EAC
Other Formulas to KnowOther Formulas to Know
• Communication Channels: N(N-1)/2
• Pert Mean: (Pessimistic + 4*Most Likely + Optimistic) / 6
• Standard Deviation: (Pessimistic – Optimistic) / 6
• Variance: ((Pessimistic – Optimistic) / 6) squared
• Present Value or PV: Future Value / (1+ rate of return) to the power of n. Where n = periods of time.