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Earned Schedule (ES) is a breakthrough analytical technique that resolves the EVM (Earned Value Mangement) dilemma. It is derived from and is an extension to EVM. No additional data is needed for acquiring the ES measures; only the data from EVM or PPR is needed. In contrast to the cost-based indicators from EVM, the ES schedule performance indicators are time-based, making them easier to comprehend. The ES indicators provide a status and predictive ability for schedule, analogous to the facility for cost using EVM. Earned Schedule is the bridge between EVM and schedule analysis. It has been shown that ES can be used for detailed schedule analysis and that it has the potential to improve both cost and schedule prediction.  

Have you ever used the Earned Schedule technique for analysis of your schedule? It is the good method if you want to measure the schedule performance, current trend the forecast completion date. There are some terminology before going to the detailed analysis, you can read the following formula explanation then open the attached excel file, this excel file indicate so simple how using this technique in your project (for engineering or construction phase).

This table indicates the accepted the ES terminology for an analogous measure or indicator.

The above table breaks down the ES terminology to measures, indicators, and predictors. The terminology depicted in this table has a few terms requiring definition:

PD = Planned Duration
ED = Estimated Duration
PF(t) = Performance Factor (time-based)

The time-based performance factor is analogous to the PF used in the EVM equation