Activity Details (9001 - " Spillway - Concrete " ) :

Duration: 175 days in the Normal schedule.

To calculate Late Start (LS), the Late Finish (LF) is required. LS is calculated by subtracting the activity ' s duration from the LF.

Formula for Late Start (LS): LS = LF.9001 - Dur.9001.

Date Calculation:

Late Finish (LF.9001) = 11-20-02 (given or derived).

Apply the formula: LS.9001 = LF.9001 - Dur.9001 = 11-20-02 - 175 days .

Cross-Verification of Dates:

After subtracting 175 days, LS.9001 = 11-20-02 .

Cross-Verification with Answer Options:

Option A : Incorrect. EF (Early Finish) is not needed for this calculation.

Option B : Incorrect. Uses LS and Dur incorrectly without connecting to LF.

Option C : Incorrect. Data provided is sufficient.

Option D : Correct. Matches both the formula and the date calculation.

 Understanding the Problem :

The question asks which risk cannot be estimated using only a resource-loaded schedule .

A resource-loaded schedule contains detailed information about activities, resources (labor, materials, equipment), and their associated costs but does not provide external information unrelated to project resources.

 Analysis of Each Option :

A. Delay due to SDOT ' s other projects :

This risk depends on external factors beyond the control or visibility of the resource-loaded schedule, such as project interactions, priorities, or resource allocation managed by SDOT (the State Department of Transportation) .

A resource-loaded schedule cannot estimate this delay , as it does not account for external dependencies or priorities outside the project ' s scope.

This is the correct answer .

B. Delay due to labor shortage :

A resource-loaded schedule tracks labor availability and allocation. By analyzing resource constraints, it can estimate potential delays due to labor shortages.

This risk can be estimated using the schedule.

C. Liquidated damages on the SDOT contract :

Liquidated damages are linked to project delays. A resource-loaded schedule can estimate the delay impact and calculate potential damages based on contract terms.

This risk can be estimated .

D. Cost overruns due to cement shortage :

Cement shortages directly affect the material resource allocations in the schedule. A resource-loaded schedule can estimate cost overruns by analyzing material usage and constraints.

This risk can be estimated .

 Final Answer and Justification :

Option A is correct because a resource-loaded schedule cannot consider or predict delays caused by external projects managed by other entities like SDOT.

All other risks relate to project resources or scheduling, which can be analyzed using a resource-loaded schedule.

 Study Guide Reference :

Refer to the PSP Certification Study Guide, Chapter 2 – Scheduling, sections on Schedule Maintenance and Risk Analysis (p. 209), and Resource-Constrained S cheduling (p. 163).

AACE Recommended Practice 57R-09: " Integrated Cost and Schedule Risk Analysis " provides additional insights into risks measurable through schedules.

 Activity Duration Estimation Techniques :

Accurate estimation methods include de tailed breakdowns, using experienced personnel, and analyzing specific factors for individual activities.

Relying on gross estimates or averages (as in A) introduces significant inaccuracies.

 PSP Study Guide References :

The PSP Study Guide emphasizes th e importance of detailed and specific input to improve estimation accuracy​.

 Analysis for Selection :

Option A : Incorrect method, as averages do not provide accurate results for individual activities.

Option B : Misguided suggestion; focusing independently on activities without logic paths introduces potential errors.

Option C : Correct. Dividing activities enhances detail and estimation precision.

Option D : Correct. Involving the executors ensures realistic and experienced-based durations.

 Conclusion : The correct answer is A , as using gross estimates is not an effective method for improving accuracy.

 Critical Path Characteristics :

The critical path is the longest path through the network, defining the minimum project completion time. It cannot be the shortest path.

 PSP Study Guide References :

Critical path analysis emphasizes that it is determined by network logic and represents the chain of activities controlling the project duration​.

 Analysis for Selection :

Option A, C, and D : Accurately describe the critical path.

Option B : I ncorrect; the critical path is not the shortest path.

 Conclusion : The correct answer is B , as the critical path is the longest path, not the shortest.

The time an activity can be delayed from its early start without impacting the overall project completion date is called total float .

Option A (negative float) refers to delays beyond permissible limits.

Option B (free float) refers to delays without affecting the early start of any successor.

Option D (interfering floa t) is a lesser-used term denoting the time available without delaying the project completion but affecting a successor’s float​.

 Activity 11001 Characteristics:

Activity 11001 (Spillway - Concrete) is logically defined as the final activity in the project.

Final activities in a project typically do not have successor activities since they signify p roject completion.

 Exclusion of Other Options:

Option A: Circular logic does not apply since the scheduling logic is linear and follows standard precedence diagramming methods.

Option B: Activity 11001 is not penultimate but the final activity.

Option C : The scheduler ' s error is highly unlikely in a controlled environment following PSP principles.

 Verification with PSP Guidelines:

The PSP Study Guide explains that final activities represent the culmination of a project ' s logical sequence and typically lack successors (Ref: PSP Study Guide, Chapter 2A: Logical Sequencing).

Total float is influenced by factors like multiple calendars, start/finish constraints, and preferential logic because these directly affect the calculation of early and late dates.

Option D (front end loading), which involves distributing work to earlier project phases, does not inhe rently affect float calculations as it primarily pertains to resource or phase management strategies​​.