EAC

Comparing the Efficacy of Independent Estimate at Completion (IEAC) Methods Using Real Project Data

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Comparing the Efficacy of Independent Estimate at Completion (IEAC) Methods Using Real Project Data

“Data! Data! Data!” he cried impatiently. “I can’t make bricks without clay.”

-Sherlock Holmes, The Adventure of the Copper Beeches

There are many discussions about EACs and evaluating EACs including using Independent EAC (IEAC) formulae to compare with the contractor EACs. With good reason, we should wonder how accurate are those IEACs that we use so often and sometimes make decisions based on them. Are we misjudging contractor’s EACs based on formulae that are weak or inappropriate?

Humphreys & Associates has initiated a study to determine how accurate IEACs are, and we would like your help. The study will compare different IEAC formulae against the Program Manager (PM) most likely EAC at the 25, 50, and 75 percent complete point for completed projects. The objective is to assess how closely the IEACs and PM most likely EAC were able to predict the final cost outcome for the project.

How Accurate are IEAC Formulae?

Many formulae exist for using recorded data from an earned value management system (EVMS) to make independent estimates of the final cost at completion (EAC) for the element in question. The element might be a control account, a Work Breakdown Structure (WBS) element, or even an entire project.

What is not known is how accurate these methods are at forecasting the final actual cost for the project. This study hopes to determine that answer.

Real World IEAC Data

This study was initiated by collecting earned value data from 12 completed projects. We need projects that are completed because, on a completed project, the final actual outcome is known. We collected project data at the 25, 50, and 75 percent complete points. At each of these points, the IEAC formulae were applied to determine how closely they were able to predict the final actual cost outcome for the project. The quest is to learn how the various IEACs performed. Is any one of them more accurate than the others?

From this investigation, any indication of the relative efficacy of the formulae would be used to inform future use of the IEAC methods.

Our Method for Testing IEACs

In general, the IEAC approach is to use existing recognized formulae. We have chosen these IEACs as a starting point:

  • IEAC 1 = BAC/CPIe at the percent point reported. This formula can be stated in words as “the entire project is performed at the same efficiency as experience to date.”
  • IEAC 2 = ACWP + [BCWR/CPI (.5) + SPI (.5)]. This formula uses weighted SPI and CPI which theoretically allows for sensitivity to both cost and schedule historical performance. The weights used in this application are even at .50 and .50.
  • IEAC 3 = ACWP + [BCWR/CPI x SPI]. This formula uses the SPI and CPI multiplied together which theoretically allows for sensitivity to both cost and schedule performance to date.
  • IEAC 4 = ACWP + BCWR. This formula assumes the remaining work will be done as budgeted with no factoring.

One additional non-traditional IEAC will be used.

IEAC 5 = Use of IEAC 2 weighted SPI and CPI but decreasing the proportion applied to the SPI as the percent of project completion increases. In other words, the impact of schedule performance diminishes as the project becomes closer to completion.

We will also take the average of all the formulae to see how that works.

Initial Data Set

One aerospace contractor and one US Government agency have provided the required data for 12 completed projects with an interest in the outcome of the study. The source of the data and the specific projects will not be disclosed in the study.

These real-world projects did not have an exact 25%, 50%, or 75% dataset. The closest dataset to each of those completion percentages was used. One example dataset looks like this (color coding should be ignored):

Example Product Data

How can you help?

We need more project data to gather enough varying project outcomes to make the test realistic. We do not plan to keep the types of projects or products separate but will take all the data we can get and look at them all.

Please consider providing data for the study. We have created an Excel spreadsheet template to help gather project data in a common format for analysis. You can download this template here. Add as many tabs as needed for each project. Send your completed spreadsheet to humphreys@humphreys-assoc.com.

In a separate blog we will outline other help we need to complete the study and to analyze the results.

IEAC_Study_Project_Data_Template-Rev-06052023Download

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Using Earned Value Management (EVM) Performance Metrics for Evaluating EACs

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A previous blog, Maintaining a Credible Estimate at Completion (EAC), discussed why producing a realistic EAC is essential to managing the remaining work on a contract. Internal management and the customer need visibility into the most likely total cost for the contract at completion to ensure it is within the negotiated contract cost and funding limits.

As noted in the earlier blog, one common technique to test the realism of the EAC is to compare the cumulative to date Cost Performance Index (CPI) to the To Complete Performance Index (TCPI).

Example of Using the Metrics for Evaluating Data

One example of documented guidance to industry for evaluating the realism of the EAC is the DOE Office of Project Management (PM) Compliance Assessment Governance (CAG) 2.0, and the related DOE EVMS Metric Specifications they use to assess the quality of schedule and cost data. This blog highlights the use of this guidance and how any contractor can incorporate similar best practices to verify EACs at a given WBS element, control account, or project level are realistic.

To refresh, the CPI is the efficiency at which work has been performed so far for a WBS element, control account, or at the total project level. The formula for the cumulative to date CPI is as follows.

Best practice tip: To ensure a valid CPI calculation, verify the BCWP and ACWP are recorded in the same month for the same work performed.

The TCPI provides the same information, however, it is forward looking. While the CPI is the work efficiency so far, the TCPI is the efficiency required to complete the remaining work to achieve the EAC. The formula for the TCPI is as follows.

TCPI Formula

Best practice tip: To ensure a valid TCPI, verify the BCWP and ACWP are recorded in the same month for the same work performed, and the BAC and EAC are for the same work scope. In other words, the scope of work assumptions are the same for the budget and remaining cost. This is why anticipated changes should not be included in the EAC.

The DOE uses the CPI in two of their assessment metrics and the TCPI in one, however, these are critical metrics partly because they are the only ones used to assess two different data evaluations: 1) commingling level of effort (LOE) and discrete work, and 2) EAC realism.

Commingling LOE and Discrete Work

The first use of CPI (no TCPI in this metric) falls under the Budgeting and Work Authorization subprocess. The primary purpose is to evaluate the effect of commingling LOE and discrete work scope has on control account metrics. The basic premise for this metric is that if the CPI for the LOE scope is significantly different than that for the discrete, the mixture of LOE in that control account is likely skewing overall performance reporting.

Here is the formulation DOE uses.

C.09.01:  Control Account CPI delta between Discrete and LOE >= ±0.1

X = Number of incomplete control accounts (WBS elements) in the EVMS cost tool, where

  1. The LOE portion of the budget is between 15% and 80% of the total budget, and
  2. The difference between the CPI for the discrete work and the LOE work is >= ±0.1.
Y = Number of incomplete control accounts (WBS elements) in the EVMS cost tool.
Threshold = 0%

Best practice tip: Run this metric quarterly on your control accounts that commingle LOE and discrete work packages. When there is a significant discrepancy between the performance of the LOE versus discrete work effort, consider isolating the LOE effort from the discrete effort at the earliest opportunity. An example could be the next rolling wave planning window or as part of an internal replanning action. Alternatively, it may be necessary to perform the calculations at the work package level to assess the performance of just the discrete effort when it is impractical to isolate by other means.

Process and procedure tip: Ensure the LOE work packages within a control account are kept to minimum (typically less than 15%), during the baseline development phase. This helps to prevent discrete work effort performance measurement distortion during the execution phase. A useful best practice H&A earned value consultants have helped contractors to implement during the budget baseline development process is to perform an analysis of the earned value methods used within a control account and the associated work package budgets. This helps to verify any LOE work packages are less than the 15% threshold for the control account. In some instances, it may be logical to segregate the LOE work effort into a separate control account. The objective is to identify and resolve the issue before the performance measurement baseline (PMB) is set.

EAC Realism

One DOE metric uses the TCPI and this involves a comparison to the CPI. This falls in the Analysis and Management Reporting subprocess. This DOE EVMS Metric Specification states: “This metric confirms that estimates of costs at completion are accurate and detailed.” As noted above, the metric compares the cost performance efficiency so far to the cost efficiency needed to achieve the EAC and is specific to the EAC a control account manager (CAM) would review for their scope of work. Depending on the level actual costs are collected, this analysis may need to be performed at the work package level instead of the control account level.  

Here is the formulation DOE uses assuming actual costs are collected at the work package level.

F.05.06:  Work Package CPI – EAC TCPI > ±0.1
X = Number of incomplete (>10% complete) work packages where CPI –TCPI > ±0.1.
Y = Number of incomplete (>10% complete) work packages in the EVMS cost tool.
Threshold = 5%

There is no requirement that the forecast of future costs has a linear relationship with past performance. While there may be legitimate reasons why future cost performance will fluctuate from the past, outside reviewers who receive EVM data will look for a trend or preponderance of data that would indicate the EACs are not realistic. When a significant number of active work packages are outside the ±0.1 CPI-TCPI threshold, it is an indication that the EACs are not being maintained or are driven by factors other than project performance.

Best practice tip: Run this metric every month for each active work package prior to month-end close. For those work packages outside the ±0.1 threshold, review the EAC to ensure it is an intentional forecast of costs given the current conditions.

Process and procedure tip: One of the training courses H&A earned value consultants often conduct is a Variance Analysis Reporting (VAR) workshop. This workshop is designed to help CAMs become more proficient with using the EVM metrics to assess the performance to date for their work effort, identify the root cause of significant variances, and document their findings as well as recommended corrective actions. This analysis includes verifying their estimate to complete (ETC) is a reasonable assessment of what is required to complete the remaining authorized work and their EACs are credible.

 

Additional References

Further discussion on using the CPI and TCPI to assess the EAC realism at the project level can be found in the DOE CAG, Analysis and Management reporting subprocess, Estimates at Completion. This section provides a good overview of comparing the cumulative to date CPI to the TCPI as well as comparing an EAC to calculated independent EACs (IEACs) for further analysis to assess the EAC credibility. 

Interested in learning more about using EVM metrics as a means to verify EACs at the detail or project level are realistic? H&A earned value consultants can help you incorporate best practices into your processes and procedures as well as conduct targeted training to improve your ETC and EAC process. Call us today at (714) 685-1730.

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Maintaining a Credible Estimate at Completion (EAC)

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Issues with a contractor’s estimate at completion (EAC) process is a common Earned Value Management System (EVMS) surveillance finding H&A earned value consultants are frequently asked to help resolve. The EAC process can become a major issue when the government customer lacks confidence in the contractor’s EAC data.

Why does a credible EAC matter? 

EACs are important because they provide a projection of the cost at contract or project completion, which is also an estimate of total funds required by the customer. It matters because EACs represent real money. When the most likely EAC exceeds the negotiated contract cost, the contractor’s profit margins may be at risk. It also creates a problem for the customer when the most likely EAC exceeds the funding limits. The customer may either need to secure additional funding or modify the work scope. No one likes cost growth surprises.

Figure 1 illustrates comparing the funding limits with the range of contractor’s EACs to verify they are within the bounds of the funding available to complete the scope of work.

Graph Showing Contractor’s Management EACs with Funding Profile
Figure 1: Contractor’s Management EACs with Funding Profile

What determines whether an EAC is credible? 

A credible EAC reflects the cumulative to date actual costs of work performed (ACWP) (costs the contractor has already incurred) plus the current estimate to complete (ETC). The ETC must provide a realistic estimate of what is required to complete the remaining authorized work and represents the time phased estimate of future funds required.

EACs should be based on performance to date, actual costs to date, projections of future performance, risks and opportunities, economic escalation, expected direct and indirect rates, and material commitments. As illustrated in Figure 1, a project manager should routinely evaluate their project’s ACWP, ETC, and EAC along with the funding profile to verify amounts expended and committed are within the parameters of available contract funds. 

What project control practices help to ensure EACs are realistic?

Three recommended best practices H&A earned value consultants either help implement or have observed that ensure the EAC data are credible include:

  1. Actively maintain the bottom up ETC data every reporting cycle. This starts with updating the current schedule resource loaded activities based on performance to date and the latest planning (timing and resource requirements) for work in progress as well as upcoming work effort. This becomes the basis for updating the time phased cost estimate for work in progress that is added to the cumulative to date actual costs or the cost estimate for future work/planning packages. The current schedule and time phased cost estimate should be in alignment. When data is routinely maintained, it minimizes the time required to update it and capture useful information. The control account managers (CAMs) have the basis to substantiate their estimates as well as relevant data they can use to analyze and take action to address a significant variance at completion (VAC).
  2. Actively monitor project EACs from the top down. Project managers that actively maintain a range of data driven EACs (best case, most likely, and worst case) are better prepared to verify the bottom up EACs are realistic, handle realized risks, and prepare for emerging risks. They routinely incorporate metrics such as comparing the Cost Performance Index (CPI) to the To Complete Performance Index (TCPI) to test the realism of the EAC. They can demonstrate their EACs are credible with backup data, rationale, and narratives they provide to management as well as the customer. 
  3. Maintain open communications at all levels of management, subcontractors, and the customer. As a result, project personnel can quickly handle issues or project changes. The project manager is often the main conduit to handle impacts to their project’s EAC such as when corporate management changes direct or indirect rates, changes in resource availability, a spike in commodity prices, or the customer modifies the scope of work or funding.

What are some things to avoid?

H&A earned value consultants often observe practices that negate the purpose and value of maintaining the ETC and EAC data. Issues with the EAC process are often captured in the government customer’s EVMS corrective action requests (CARs). The CARs frequently point out ad-hoc processes or corporate culture issues. Examples:

  1. Management provides a target EAC number the CAMs must match. This approach increases the likelihood the ETC data are unrealistic. There may be a valid reason for this directive as a management what-if exercise. When done as a routine management strategy, it diminishes the value of the ETC data to manage the project’s remaining work and prevent financial surprises. The CAMs should be in a position where they can substantiate their schedule timeline, resource requirements, and cost estimate to complete the remaining work. The project manager should be in a position where they can verify the bottom up ETC/EAC data to establish a level of confidence in their project level EACs they provide to management as well as the customer.
  2. Project personnel take the path of least resistance. This is often a result of a lack of direction or an established process. They either do not create the ETC data or maintain it on a routine basis. A typical approach is to set a cost management tool option where the EAC is static; the CAM may manually update the EAC number once a quarter. The ETC data has limited to no value. This usually surfaces as a major issue when the contractor must provide an Integrated Program Management Report (IPMR)  Format 7 (time phased history and forecast data), or the Integrated Program Management Data and Analysis Report (IPMDAR) Contract Performance Dataset (CPD) to the customer. The customer quickly discovers the ETC data is lacking for their own analysis.
  3. Schedule and cost are created/maintained separately. This often occurs when the schedule and cost tools are not integrated for the duration of the project. A good deal of effort may go into ensuring the schedule and cost data are in alignment to establish the performance measurement baseline (PMB). The integrated master schedule (IMS) resource loaded activities may be used as the basis for the time phased budget baseline in the cost tool. However, the ETC data in the current schedule may not exist or actively maintained. Project personnel only maintain the ETC data in the cost tool and fail to verify it aligns with the current schedule activities (timing) and resource requirements. Once again, personnel are often lacking an established best practice EAC process.

Pay Attention to Your EAC Process

The ETC and EAC data are just as important as the PMB budget plan because it represents real money. As discussed in the blog How Integrated Baseline Reviews (IBRs) Contribute to Project Success, the goal of the IBR is to verify an executable PMB has been established for the entire contractual scope of work. Similarly, the goal of maintaining a credible ETC and EAC is to verify an executable plan is being regularly updated to accomplish the remaining scope of work within the contract’s schedule, cost, and funding targets. The customer must have confidence in the contractor’s ability to deliver and meet the remaining contract objectives.

The best way to avoid an EAC process CAR is to ensure you have an established process personnel follow, and they know how to use the schedule and cost tools to consistently maintain quality ETC and EAC data. H&A earned value consultants have worked with numerous clients to design or enhance their EAC process. H&A also offers EVMS training workshops that include content on how to develop a realistic EAC. Regular EVMS training always helps to reinforce best practices. Call us today at (714) 685-1730 to get started.

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Variance Analysis, Corrective Action Plans, Root Cause Analysis

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Variance Analysis “provides EVMS contract management with early insight into the extent of problems and allows corrective actions to be implemented in time to affect the future course of the program.” [NDIA ANSI EIA 748 Intent Guide] Department of Defense Data Item Descriptions: DI-MGMT-81861, Integrated Program Management Report (IPMR) paragraphs 3.6.10xx; DI-MGMT-81466A, Contract Performance Report, paragraph 2.6.3; and DI-MGMT-81650, Integrated Master Schedule (IMS) — paragraph 2.5 — all require analysis for significant variances including cause, impact and corrective action plans.  By comparing the performance against the plan, it is possible to make mid-course corrections which assist completion of the project on time and within the approved budget. The Variance Analysis Report (VAR) is a “living, working document to communicate cause, impact and corrective action”. [See: Chapter 35 Variance Analysis and Corrective Action, Project Management Using Earned Value, Humphreys & Associates, page 707.] Well-written variance analyses should answer the basic questions of why, what and how.

Cause is also known as root cause, nature of the problem, problem statement, issue, or problem definition. Root cause is the fundamental reason for the problem. Root cause is required in order to take preventative corrective action. The explanation of the variance is broken down into each of its components: discuss schedule variances separately from cost variances; discuss labor separately from non-labor; discuss which portion of the variance was caused by efficiency (hours) and which portion was because of dollars (rates) or if the variance was driven by material discuss how much was because of price and how much was because of usage. For more information refer to Humphreys & Associates blog Variance Analysis-Getting Specific.

Once the root cause of the problem has been identified and described, the impact(s) on the project should be addressed. Identify impacts to customers, technical capability, cost, schedule (including when the schedule variance will become zero), other control accounts, program milestones, subcontractors, and the Estimate at Completion, including rationale.

A corrective action (CA) plan should be developed that describes the specific actions being taken, or to be taken, which includes the individual or organization responsible for the action(s). The corrective actions should be directly derived from root cause analysis and related to each identified root cause.   Results from previous corrective action plans should be included.  Occasionally, a successful plan will include interim modifications or fixes in the short term, with long term changes identified as well. When no corrective action for an overrun is possible, an explanation and EAC rationale should be included.  A corrective action log should be used that tracks the actions taken and the status of the corrective plan for each variance analysis cycle.  As was stated in the Humphreys & Associates article:  Corrective Action Response: Planning and Closure – Part 2 of 2  “It is critical that verification methods, objective measures, metrics, artifacts, and evidential products are identified that will verify that the corrective actions are effective.”  Corrective action plans based on clearly a defined root cause facilitates time management action and avoids the occurrence of repetitive problems.

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