What is the portfolio Epic size estimate unit?

• A. Story Points
• B. Hours
• C. Days
• D. Function Points

Answer: (A)

In SAFe, portfolio Epic size is estimated using Story Points. This provides a relative measure of effort and complexity that can be compared across epics, regardless of which teams or technologies are involved. Using story points supports WSJF prioritization, since the size (the denominator) remains a consistent, relative unit when calculating cost of delay divided by size. Estimating in hours or days ties size to individual velocity and calendar time, making cross-epic comparisons unreliable. Function points are less commonly used in SAFe for portfolio epics. Therefore, Story Points best fit the need for consistent, scalable sizing and effective prioritization at the portfolio level.