CPI vs. TCPI EAC Chart

The CPI vs. TCPI EAC chart on the EAC Realism tab compares, over time, the cumulative or current cost performance index (CPI) and the to-complete performance index (TCPI to EAC). CPI indicates actual cost efficiency to date, and TCPI to EAC indicates the efficiency required in the future to meet the estimate to complete.

Chart Format

The CPI vs. TCPI EAC chart is a line chart, with a separate line for each variance.

Chart Item	Description
Horizontal axis	The horizontal axis displays the range of periods.
Vertical axis	The vertical axis displays the range of index values.
Lines	Each line represents the change in value for one of the indexes over the range of periods. Each data point on the line represents the index value for that period.

CPI vs. TCPI EAC Chart Data

You can display the CPI values for each period based either on cumulative or current data.

Data Item	Description
CPI	Cost performance index value for each period.
TCPI to EAC	To-complete performance index for each period: (BAC – BCWPcum) / (LRE – ACWPcum).