ES Calculators _ Earned Schedule

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ES Calculator v1b (does not account for partial periods) ES Calculator v2c (does account for partial periods) ES Calculator vs1c (special cases) ESLP Calculator v1b PFactor Calculator v1b SA Index & Rework Calculator v2 Prediction Analysis Calculator v1 Statistical Forecasting Calculator v2c The Earned Schedule (ES) calculators are freely available and downloadable from this site. There are two Excel spreadsheets. The one most used (v1) does not account for partial periods, that is, the first period and the last. The second version (v2) does account for partial periods. The v1 calculator assumes in the calculations that all periods are full and not partial. Once several periods are involved in the calculation, the error introduced becomes negligible. For those that are applying ES to weekly Earned Value, the error is small from the outset. For a discussion of the error in the ES calculation please reference the Presentations page for the .pdf file, “Earned Schedule Training,” 17th IIPMC, Nov 79, 2005. The section “Interpolation Error” discusses the partial period along with other sources of error. The special case ES calculator is intended for small projects having downtime and stop work conditions. The calculator produces special indicators and forecasts. Comparison of the special to uncorrected ES forecast is made available. The Earned ScheduleLongest Path calculator assists in making the longest path forecasts. It is very similar to the basic ES calculator, and is easy to apply. To determine the longest path, forecasts are to be made for all network paths of the schedule which conclude at project completion. For each status point, the path having the longest duration forecast is taken to best represent the project. The PFactor calculator is a set of Excel spreadsheets. From the baseline schedule and actual performance, the calculator provides a numerical indicator of how well the schedule is followed, i.e. a measure of “schedule adherence.” Other outputs from the calculator are the identification of tasks which may be experiencing constraints or impediments, forecast of final cost and duration, high and low outcome prediction, and probability of meeting the project cost and schedule commitments. The Schedule Adherence and Rework Calculator utilizes the periodic values for the Pfactor and the EV accrued to compute and graph the EV accomplished out of sequence and the rework it causes. The Prediction Analysis Calculator identifies the likelihood that the project will complete at a desired time (ED). The spreadsheet determines the point at which the project exceeds the threshold and becomes “out of control.” The calculator is useful for assessing the opportunity for project recovery and having a successful outcome. Statistical Forecasting Calculator (v2c) computes high and low confidence limits for final cost and schedule duration. The calculator is reasonably simple to apply. The user does not require indepth understanding of statistics. Concept Description EVM Time Forecasting Contacts Training Sources Sites of Interest EVM ES Tools ES Book ES Book (translation) Copyrights & Trademarks

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ES Calculators _ Earned Schedule

Transcript of ES Calculators _ Earned Schedule

Page 1: ES Calculators _ Earned Schedule

3/30/2015 ES Calculators | Earned Schedule

http://www.earnedschedule.com/calculator.shtml 1/2

ES Calculator v1b (does not account for partial periods)

ES Calculator v2c (does account for partial periods)

ES Calculator vs1c (special cases)

ESLP Calculator v1b

PFactor Calculator v1b

SA Index & Rework Calculator v2

Prediction Analysis Calculator v1

Statistical Forecasting Calculator v2c

 

 

 The Earned Schedule (ES) calculators are freely available and downloadable from this site.  There are twoExcel spreadsheets.  The one most used (v1) does not account for partial periods, that is, the first periodand the last.  The second version (v2) does account for partial periods.

The v1 calculator assumes in the calculations that all periods are full and not partial.  Once several periodsare involved in the calculation, the error introduced becomes negligible.  For those that are applying ES toweekly Earned Value, the error is small from the outset.

For a discussion of the error in the ES calculation please reference the Presentations page for the .pdf file,“Earned Schedule Training,” 17th IIPMC, Nov 79, 2005.  The section “Interpolation Error” discusses thepartial period along with other sources of error.

 

The special case ES calculator is intended for small projects having downtime and stop work conditions.The calculator produces special indicators and forecasts. Comparison of the special to uncorrected ESforecast is made available.

 

The Earned ScheduleLongest Path calculator assists in making the longest path forecasts. It is verysimilar to the basic ES calculator, and is easy to apply. To determine the longest path, forecasts are to bemade for all network paths of the schedule which conclude at project completion. For each status point, thepath having the longest duration forecast is taken to best represent the project.

The PFactor calculator is a set of Excel spreadsheets.  From the baseline schedule and actualperformance, the calculator provides a numerical indicator of how well the schedule is followed, i.e. ameasure of “schedule adherence.”  Other outputs from the calculator are the identification of tasks whichmay be experiencing constraints or impediments, forecast of final cost and duration, high and low outcomeprediction, and probability of meeting the project cost and schedule commitments.

The Schedule Adherence and Rework Calculator utilizes the periodic values for the Pfactor and the EVaccrued to compute and graph the EV accomplished out of sequence and the rework it causes.

The Prediction Analysis Calculator identifies the likelihood that the project will complete at a desired time(ED). The spreadsheet determines the point at which the project exceeds the threshold and becomes “outof control.” The calculator is useful for assessing the opportunity for project recovery and having asuccessful outcome.

Statistical Forecasting Calculator (v2c) computes high and low confidence limits for final cost andschedule duration. The calculator is reasonably simple to apply. The user does not require indepthunderstanding of statistics.

 

Concept Description

EVM Time Forecasting

Contacts

Training Sources

Sites of Interest

EVM  ES Tools

ES Book

ES Book (translation)

Copyrights & Trademarks

  

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  Application Instructions

  Example – Late Finish, daily status

Statistical Planning Calculator

Stability Point Calculator

Statistical Planning Calculator (Probability & Reserves) is intended to assist planning teams forstrategizing the amounts of cost and schedule reserve needed to achieve a desired probability ofsuccess.  Use of the calculator requires either estimates or historical variation from past projects.

The Stability Point Calculator determines the observation number in a sequence of CPI and SPI(t) valuesat which all subsequent observations are within a defined stability limit.  

 

 Copyright © 2006 Walt Lipke