The answer is to fast-track the project by overlapping activities on the critical path. This is correct because only changes to the critical path can reduce overall project duration; fast-tracking applies schedule compression by performing critical path tasks in parallel rather than sequentially, directly cutting time without adding resources. On the CAPM exam, this question tests your understanding that total float on non-critical activities is irrelevant to duration reduction—a common trap is choosing to add resources to a non-critical task or increase its float, which does nothing to shorten the project. Remember the key rule: to shrink the schedule, you must attack the critical path. A useful memory tip is “Float is for fun, critical path is for crunch”—only the critical path determines the finish date, so fast-tracking there is the most appropriate action for a three-day reduction with lower risk than crashing.
CAPM Predictive Plan-Based Methodologies Practice Question
This CAPM practice question tests your understanding of predictive plan-based methodologies. Compare every option against the stated constraints before choosing — the best answer satisfies all requirements, not just the most obvious one. 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.
In a predictive project, the project manager has calculated the critical path and determined that the project duration is 100 days. The total float for a non-critical activity is 5 days. If the project manager wants to reduce the overall project duration by 3 days, which action is MOST appropriate?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Fast-track the project by overlapping activities on the critical path
To reduce project duration, the focus must be on the critical path. Fast-tracking by overlapping activities on the critical path can reduce duration with less risk than crashing. Adding resources to a non-critical activity or increasing float will not affect the project duration.
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.
✓
Fast-track the project by overlapping activities on the critical path
Why this is correct
Fast-tracking applies schedule compression to critical path activities, potentially reducing duration without increasing cost significantly.
Related concept
Static NAT maps one inside address to one outside address.
✗
Increase the total float of the critical path by adding buffer
Why it's wrong here
Adding buffer would increase, not decrease, project duration.
✗
Add more resources to the non-critical activity to reduce its duration
Why it's wrong here
Reducing duration of a non-critical activity does not affect overall project duration because it has float.
✗
Crash the non-critical activity to reduce its duration by 3 days
Why it's wrong here
Crashing a non-critical activity is ineffective; only critical path compression reduces project duration.
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.
What to study next
Got this wrong? Here's your next step.
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 CAPM NAT questions on configuration and troubleshooting.
Predictive Plan-Based Methodologies — This question tests Predictive Plan-Based Methodologies — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Fast-track the project by overlapping activities on the critical path — To reduce project duration, the focus must be on the critical path. Fast-tracking by overlapping activities on the critical path can reduce duration with less risk than crashing. Adding resources to a non-critical activity or increasing float will not affect the project duration.
What should I do if I get this CAPM 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 CAPM NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
About these practice questions
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These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A project manager is leading a construction project with a fixed budget and strict deadline. During execution, a key supplier notifies that a critical material will be delayed by two weeks, which will push the project past the deadline. The project manager reviews the schedule and identifies that the delay can be compensated by fast-tracking two subsequent activities that are currently planned sequentially. What should the project manager do first?
medium
A.Accept the delay and update the project schedule accordingly.
✓ B.Assess the risks of fast-tracking the two activities.
C.Submit a change request to extend the deadline.
D.Immediately add resources to the delayed activity to catch up.
Why B: The correct first step is to assess the risks of fast-tracking the two activities (Option B). Fast-tracking involves performing activities in parallel that were originally planned sequentially, which can introduce new risks such as rework, resource conflicts, or quality issues. The PMBOK Guide emphasizes that before implementing a schedule compression technique, the project manager must evaluate the associated risks and determine if the benefits outweigh the potential negative impacts. Since the project has a fixed budget and strict deadline, a risk assessment ensures informed decision-making before proceeding.
Variation 2. You are managing a predictive project to build a new office building. The project is in the execution phase. During a weekly progress meeting, the electrical contractor reports that a critical piece of switchgear has a 6-week lead time, but it was not ordered because the team assumed it would be procured later. The project schedule shows the switchgear installation activity is supposed to start in 4 weeks. The project manager reviews the procurement management plan and realizes the procurement process was not followed. The project has a tight deadline and cannot accommodate a 6-week delay. What is the best course of action for the project manager?
medium
A.Submit a change request to the CCB to extend the project schedule by 6 weeks.
✓ B.Expedite the procurement process by contacting the supplier to negotiate a faster delivery and simultaneously fast-track remaining activities to recover time.
C.Crash the project schedule by adding resources to other activities to offset the delay.
D.Implement a change request to reduce the scope of work, eliminating the need for the switchgear.
Why B: Option B is correct because the project manager must first attempt to recover the schedule by expediting procurement and fast-tracking remaining activities before considering formal changes. This aligns with the iterative nature of the execution phase, where the focus is on corrective action within the existing constraints. The procurement management plan was not followed, so the PM must now apply a workaround to mitigate the delay without immediately escalating to a change request.
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This CAPM practice question is part of Courseiva's free PMI certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the CAPM exam.
Question Discussion
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