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 Schedule-Longest 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 ES re-plan calculator is useful when a project has undergone significant changes to its PMB. The forecast of total duration for the project is computed by adding the accrued time duration from project start through the re-plan to the forecast for the project portion remaining. The time-based indicators represent performance after the re-plan.
The Milestone SV(t) Forecast calculator is useful for assessing whether a project milestone or significant event is achievable. To effectively use the calculator requires the creation of the PMB using the tasks associated with the milestone. Output of the calculator is computed values for the schedule variance forecast to the milestone date, F-SV(t), and the milestone to complete index, TSPIM.
The P-Factor 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.” An output from the calculator useful to management is the identification of tasks which may be experiencing constraints or impediments.
The Schedule Adherence and Rework Calculator utilizes the periodic values for the P-factor 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. As well, the calculator assists with creating a reasonable recovery strategy.
The Probability of Recovery Calculator identifies whether the threshold values for TSPI and TCPI have been exceeded. Also provided in the output is the period of opportunity for recovery as well as the probability of recovery for both project cost and duration. The calculator is very easy to apply, needing only EVM and ES data normally available.
Statistical Forecasting Calculator computes high and low confidence limits for final cost and schedule duration. The calculator is reasonably simple to apply. The user does not require in-depth understanding of statistics.
The Forecasting Method Selector Calculator provides duration forecasts with improved accuracy, by appropriately selecting between two duration forecasting formulas: IEAC(t) = PD/SPI(t) or IEAC(t) = AT + (PD – ES).
Statistical Planning Calculator (Probability &
Reserves) is intended to assist planning teams for strategizing
the amounts of cost and schedule reserve needed to achieve
a desired probability of success. 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) values at which
all subsequent observations are within a defined stability
limit.
