"A measure of cost efficiency on a project. It is the ratio of earned value (EV) to actual costs (AC). CPI = EV divided by AC. " (Cynthia Stackpole, "PMP® Certification All-in-One For Dummies®", 2011)
"The ratio of budgeted costs to actual costs (BCWP/ACWP). To forecast the cost at completion, multiply the original cost baseline by CPI." (Bonnie Biafore, "Successful Project Management: Applying Best Practices and Real-World Techniques with Microsoft® Project", 2011)
"The ratio of earned value to actual cost, indicating how close the planned cost for completed work is to the actual cost. A CPI greater than 1 means the project is under budget. A CPI less than 1 means the project is over budget." (Bonnie Biafore & Teresa Stover, "Your Project Management Coach: Best Practices for Managing Projects in the Real World", 2012)
"A measure of the cost efficiency of budgeted resources expressed as the ratio of earned value to actual cost." (For Dummies, "PMP Certification All-in-One For Dummies" 2nd Ed., 2013)
"The ratio of Earned Value of an activity to its Actual Cost. CPI = BCWP/ACWP or CPI = EV/AC." (Christopher Carson et al, "CPM Scheduling for Construction: Best Practices and Guidelines", 2014)
"A measure of cost efficiency on a project. It is the ratio of earned value (EV) to actual costs (AC). CPI=EV divided by AC." (Jeffrey K Pinto, "Project Management: Achieving Competitive Advantage 5th Ed.", 2018)
"Ratio of earned value to actual cost to measure efficiency of budgeted resources." (Cate McCoy & James L Haner, "CAPM Certified Associate in Project Management Practice Exams", 2018)
"A measure of the cost efficiency of budgeted resources expressed as the ratio of earned value to actual cost. See also schedule performance index (SPI)." (Project Management Institute, "Practice Standard for Scheduling" 3rd Ed., 2019)
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