To-Complete Performance Index (TCPI)

To-Complete Performance Index (TCPI)

Introduction: Why This Matters

The To-Complete Performance Index (TCPI) is one of the most strategic formulas in Earned Value Management. While CPI tells you how efficient you have been, TCPI tells you how efficient you must be going forward to achieve either the original Budget at Completion (BAC) or the revised Estimate at Completion (EAC).

On the PMP exam, TCPI often appears in situational questions that test whether you understand its role in future planning. In real-world projects, TCPI is critical when projects are running over budget or behind schedule, as it sets a performance target for the remaining work.

Purpose and Objectives

Primary Purpose: To show the level of cost performance efficiency required on the remaining work to meet a financial goal.

Key Objectives:

  • Define TCPI and explain its role in project forecasting.
  • Calculate TCPI based on BAC and on EAC.
  • Interpret whether a project’s required efficiency is realistic or unattainable.
  • Use TCPI to guide decisions about corrective action or re-baselining.
  • Recognize exam traps related to TCPI values and formulas.

Overview

TCPI uses earned value data to set a required efficiency target for the work remaining, based on whether you are aiming to meet the original budget or a revised forecast.

  • What TCPI answers: How efficient must we be from this point forward to hit BAC or EAC?
  • Where it fits: Forecasting and corrective action decisions when performance is drifting.

Characteristics

  • Forward-looking: Focuses on the required efficiency for the remaining work, not what already happened.
  • Goal-dependent: Can be calculated toward BAC or toward a revised EAC.
  • Decision-driving: Helps determine whether corrective action is realistic or a re-baseline is needed.

Practical Example

Context: An airport baggage automation project has:

  • BAC: $20,000,000
  • EV: $8,000,000
  • AC: $11,000,000
  • Current EAC forecast: $24,000,000

Activities:

  • Activity 1: Calculate TCPI toward the original budget (BAC).
  • Activity 2: Calculate TCPI toward the revised forecast (EAC).

Outcome: You can quickly see whether meeting the original budget is realistic or whether the revised forecast is the achievable target.

Step 1: TCPI based on BAC

TCPI = (BAC – EV) ÷ (BAC – AC)
= (20,000,000 – 8,000,000) ÷ (20,000,000 – 11,000,000)
= 12,000,000 ÷ 9,000,000 = 1.33
Interpretation: To meet the original BAC, the team must achieve 133% efficiency, which is unlikely given past inefficiency.

Step 2: TCPI based on EAC

TCPI = (BAC – EV) ÷ (EAC – AC)
= (20,000,000 – 8,000,000) ÷ (24,000,000 – 11,000,000)
= 12,000,000 ÷ 13,000,000 = 0.92
Interpretation: To meet the revised EAC, the team must achieve 92% efficiency, which is realistic.

Common Pitfalls

Formula Selection Errors

  • Pitfall: Forgetting which formula to use.
  • Prevention: Use BAC when the original budget remains valid; use EAC when the project has been re-forecasted.

Misreading What TCPI Represents

  • Pitfall: Confusing TCPI (future required efficiency) with CPI (past efficiency).
  • Prevention: Remember: TCPI is a target for the remaining work; CPI is the story of what already happened.

Ignoring Feasibility

  • Pitfall: Treating a very high TCPI as “just work harder.”
  • Prevention: If TCPI is significantly above 1, evaluate corrective actions and consider re-baselining if the target is unrealistic.

Denominator Mistakes

  • Pitfall: Overlooking AC in the denominator.
  • Prevention: Both versions subtract AC to reflect the remaining funding available.

Sensei Tip : When TCPI is high, do not “hope” your way out. Use it to trigger a real discussion: corrective action plan vs. re-forecast vs. re-baseline.

Exam Alert : If the question says the budget is unchanged, use TCPI (BAC). If it says the project was re-forecasted, use TCPI (EAC). The exam hides this in phrasing.

Exam Lens

Patterns on the PMP Exam:

  • Expect situational questions that require you to choose between TCPI (BAC) or TCPI (EAC).
  • Phrases like “the project budget remains unchanged” point to BAC.
  • Phrases like “the project has been re-forecasted” point to EAC.

Sample Question

Question: A project has BAC = $1,200,000, EV = $400,000, AC = $600,000, and EAC = $1,500,000. What is the TCPI based on EAC?

  1. 1.33
  2. 0.80
  3. 1.20
  4. 0.67

Correct Answer: None of the listed options exactly. The computed value is 0.89 (about 0.90), so on the exam you would choose the closest match available. If forced here, B (0.80) is the nearest.

Quick Recap Table

Metric Formula Purpose Interpretation Exam Watch Point
TCPI (BAC) (BAC – EV) ÷ (BAC – AC) Efficiency needed to meet BAC > 1 = harder, < 1 = easier Use if BAC is still valid
TCPI (EAC) (BAC – EV) ÷ (EAC – AC) Efficiency needed to meet EAC > 1 = harder, < 1 = easier Use if re-forecast applied

Key Takeaways

  • TCPI shows required efficiency for remaining work, not past performance.
  • Use BAC if the original budget is still valid; use EAC if the project has been re-forecasted.
  • A TCPI > 1 means more efficiency is required than planned; a TCPI < 1 means less efficiency is required.
  • TCPI values often reveal whether meeting BAC is realistic or if a new EAC is necessary.
  • On the exam, focus on context cues in the question to select the correct formula.

Next Step

With TCPI mastered, we will now proceed to Communication Channels, which quantify the complexity of stakeholder communication in a project team.

Bibliography

Project Management Institute. (2021). A Guide to the Project Management Body of Knowledge (Project Management Body of Knowledge) (7th ed.). Project Management Institute.

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