Earned Value Analysis (EVA) is a method that allows the project manager to measure the amount of work actually performed on a project beyond the basic review of cost and schedule reports. EVA provides a method that permits the project to be measured by progress achieved. The project manager is then able, using the progress measured, to forecast a project’s total cost and date of completion, based on trend analysis or application of the project’s “burn rate”. This method relies on a key measure known as the project’s earned value.
Read more about it on the PMI website here - https://www.pmi.org/learning/library/earned-value-management-systems-analysis-8026