EVM elements

Explanatory

Planned Value

(PV)

Cumulative maintenance effort as planned value

up to operational time t

Earned Value

(EV)

Cumulative maintenance effort up to operational

time t viewed on the same scale as BAC

Actual Cost

(AC)

Cumulative maintenance effort up to operational

time t in actual

Budget at Completion

(BAC)

Total budget at the end of open source project

Cost Variance

(CV)

$\text{E}\left[C{V}_{\mathrm{<mo>\; *\; </mo>}}\left(t\right)\right]$ obtained from EV-AC

Cost Performance Index

(CPI)

$\text{E}\left[CP{I}_{\mathrm{<mo>\; *\; </mo>}}\left(t\right)\right]$ obtained from EV/AC

Schedure Variance

(SV)

SV obtained from EV-PV

Schedule Performance Index

(SPI)

SPI obtained from EV/PV

Estimate at Completion

(EAC)

$\text{E}\left[EA{C}_{\mathrm{<mo>\; *\; </mo>}}\left(t\right)\right]$ obtained from BAC/CPI

Estimate to Complete

(ETC)

$\text{E}\left[ET{C}_{\mathrm{<mo>\; *\; </mo>}}\left(t\right)\right]$ obtained from (BAC − EV)/CPI