Cost Performance Index (CPI) measures: A Schedule efficiency B Cost efficiency as the ratio of earned value to actual cost (EV/AC) C Quality D Risk ✓ Correct Answer: Option B CPI = EV/AC. CPI > 1 = under budget, CPI < 1 = over budget, CPI = 1 = on budget. Practice PMP Exam Prep Quizzes → Browse All Questions Study Flashcards