Meanings of letters in PMP project management calculation PV, EV, AC, SV, CV, SPI, CPI

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PV、EV、AC、SV、CV、SPI、CPI Abbreviated meaning

earned value management in , There are three parameters that need to be remembered and understood ：PV、AC、EV

PV： Planned value , The amount of money that should be spent to complete a certain proportion of the workload at a given time node ;
（PLaned： plan ,Value： The number , Short for PV）

AC： actual cost , The actual total cost of actually completing the work within the specified time period ;
（ English translation ：Actual： Actually ,cost： cost , Short for AC）

EV： Earned value , The budgeted cost of actually completing the work within a given time period ;
（ English translation ：Earn： earn ,Value： The number , In short EV ）

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In the following formula , With S Initial abbreviation , It's all about speed of progress Of ,schedule. With C Initial abbreviation , It's all about cost ,cost. And there is a law , The calculation formulas are EV start

Schedule deviation SV＝EV－PV
SV>0, Ahead of schedule ,SV<0, Behind schedule

Cost deviation CV＝EV－AC
CV>0, Cost savings ,CV<0, Cost overruns

Progress performance index SPI＝EV/PV
SPI＝1, The progress is in line with the plan ,SPI>1, Ahead of schedule ,SPI<1, Behind schedule

Cost performance index CPI＝EV/AC
CPI＝1, The use efficiency of funds is average ;
CPI>1, Cost savings , Efficient use of funds ;
CPI<1, Cost overruns , Inefficient use of funds