EVM elements | Explanatory |

Planned Value (PV) | Cumulative maintenance effort as planned value up to operational time |

Earned Value (EV) | Cumulative maintenance effort up to operational time |

Actual Cost (AC) | Cumulative maintenance effort up to operational time |

Budget at Completion (BAC) | Total budget at the end of open source project |

Cost Variance (CV) | $\text{E}\left[C{V}_{\mathrm{*}}\left(t\right)\right]$ obtained from EV-AC |

Cost Performance Index (CPI) | $\text{E}\left[CP{I}_{\mathrm{*}}\left(t\right)\right]$ 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) | $\text{E}\left[EA{C}_{\mathrm{*}}\left(t\right)\right]$ obtained from BAC/CPI |

Estimate to Complete (ETC) | $\text{E}\left[ET{C}_{\mathrm{*}}\left(t\right)\right]$ obtained from (BAC − EV)/CPI |