The answer is that the team is working overtime to meet deadlines, resulting in higher labor costs. This combination of a CPI less than 1 and an SPI greater than 1 indicates the project is ahead of schedule but over budget, a classic sign of inefficient acceleration. When the team works faster—often through overtime or rework—they burn more resources (cost overrun) while completing tasks early (schedule ahead). On the PMP exam, this scenario tests your understanding of the cost-schedule trade-off, where a high SPI does not guarantee good cost performance. A common trap is to assume both indices should move together, but they measure different dimensions: SPI tracks time efficiency, CPI tracks cost efficiency. Remember the mnemonic “Fast but expensive” to recall that SPI > 1 with CPI < 1 typically means the team is rushing, not performing efficiently.
PMP Process — Managing Technical Aspects Practice Question
This PMP practice question tests your understanding of process — managing technical aspects. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Your project is halfway through its schedule, and you are performing a variance analysis. You find that the cost performance index (CPI) is 0.85 and the schedule performance index (SPI) is 1.1. What is the MOST likely cause of this situation?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The team is working overtime to meet deadlines, resulting in higher labor costs
CPI < 1 indicates cost overrun, while SPI > 1 indicates ahead of schedule. This combination often occurs when the team is working faster but inefficiently, possibly due to overtime or rework.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Scope has been reduced without corresponding cost reduction
Why it's wrong here
Scope reduction would likely improve CPI and SPI, not this pattern.
✗
There is a calculation error in the earned value data
Why it's wrong here
Assuming error without evidence is not the most likely cause.
✓
The team is working overtime to meet deadlines, resulting in higher labor costs
Why this is correct
Overtime can accelerate schedule but increases cost, explaining CPI <1 and SPI >1.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
✗
The project is under budget and ahead of schedule
Why it's wrong here
CPI <1 indicates over budget, not under budget.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this PMP question in full detail.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related PMP NAT questions on configuration and troubleshooting.
Process — Managing Technical Aspects — This question tests Process — Managing Technical Aspects — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: The team is working overtime to meet deadlines, resulting in higher labor costs — CPI < 1 indicates cost overrun, while SPI > 1 indicates ahead of schedule. This combination often occurs when the team is working faster but inefficiently, possibly due to overtime or rework.
What should I do if I get this PMP question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related PMP NAT questions on configuration and troubleshooting.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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