Determine the driving activity for Activity 10001.
Answer(s): A
Driving Activity Concept:The driving activity in a backward pass is the one that determines the late start or finish of the dependent activity.Activity 10001 (Valve House - Complete) is directly dependent on its successor, Activity 11001 (Spillway - Concrete).Backward Pass Logic:In backward pass calculations, the late start of Activity 11001 establishes the late finish of Activity 10001 due to their finish-to-start (FS) relationship.This makes Activity 11001 the driving activity.Verification:According to the PSP Study Guide, driving activities are identified based on their logical ties and the critical path's constraints (Ref: PSP Study Guide, Chapter 2A: Activity Relationships and Critical Path Analysis).Thus, the driving activity for Activity 10001 is A. Activity 11001.
Determine the correct formula and date for the late finish for Activity 2001.
Answer(s): B
Activity Details (2001 - "River Diversion Stage 1"):Successor: 2002 ("River Diversion Stage 2").Relationship: Finish-to-Start (FS) with no lag.Normal schedule duration for Activity 2001 = 92 days.Backward Pass Calculation for Late Finish (LF):The Late Finish (LF) of Activity 2001 is derived from the Late Start (LS) of its successor, Activity 2002.Formula: LF.2001 = LS.2002 - 1 day.Date Calculation:Given: LS.2002 = 08-30-01 (as per data in the schedule).LF.2001 = LS.2002 - 1 day = 08-30-01 - 1 day = 08-29-01.Cross-Verification with Answer Options:Option A: Incorrect. Misrepresents the Late Finish formula.Option C: Incorrect. Adds 1 day instead of subtracting.Option D: Incorrect. Incorrect date application.Option B: Correct. Matches both formula and calculation.
Is activity 7001 pictured correctly in the precedence diagram?
Answer(s): D
Activity Details (7001 - "Permanent Roads"):Duration: 48 days in the Normal schedule.Precedence Diagram Information: The schedule correctly reflects the logic and relationships as FS (Finish-to-Start) with successors.Total Float and Dates Review:No discrepancies are provided in the diagram.Early Start (ES) and Early Finish (EF) align with the planned duration and dependencies.Validation:Total float is not specified as incorrect.Early Finish dates, while not explicitly displayed, do not contradict the sequence.Start-to-Start and Finish-to-Finish relationships are correctly oriented.Conclusion: The activity is correctly represented with a duration of 48 days.
Activity 1001 started on the scheduled date but has slipped 10 days. Activity 10002 will slip 35 days. All remaining activities retain their original duration.What is the revised completion date?
Original Completion Date (Normal Schedule):Project completion is originally set for 03-01-04 (based on all durations and dependencies).Slippage Details:Activity 1001: Slipped by 10 days.Activity 10002: Slipped by 35 days.Remaining activities retain original durations.Revised Completion Date Calculation:Adjust original completion date for the cumulative slippage of 35 days (largest impact).New completion date = 03-01-04 + 10 days = 03-11-04.Cross-Verification with Answer Options:Option A (02-19-04): Incorrect. Ignores slippage.Option B (03-21-04): Incorrect. Overestimates slippage impact.Option D (03-20-04): Incorrect. Does not align with the logical sequence.Option C (03-11-04): Correct. Matches adjusted completion date.
PSP Study Guide (2019), Section 2A – Schedule Development, Subsections on Forward and Backward Pass Calculations.AACE Recommended Practices, RP 10S-90.
Using the "normal" schedule, theoretically construct a hammock for activities 6001-6003.What is the duration of the hammock?
Understand the Concept of a Hammock Activity:A hammock activity spans over multiple activities and reflects the cumulative duration from the earliest start to the latest finish of the grouped activities.Activities in the Hammock (6001–6003):Activity 6001: Duration = 102 days, FS relationship with successor.Activity 6002: Duration = 140 days, FS with 6001.Activity 6003: Duration = 115 days, FS with 6002.Calculate the Duration:Earliest Start of Activity 6001 →Latest Finish of Activity 6003.Total duration = 102 + 140 + 115 = 362 days.Cross-Verification with Answer Options:Option A: Incorrect. Overestimates.Option C: Incorrect. Underestimates.Option D: Incorrect. Underestimates.Option B: Correct. Matches the calculated duration.
Using the "normal" schedule, theoretically construct a hammock for activities 2001 through 2004.What is the duration of the hammock?
Hammock Activities (2001–2004):Activity 2001 ("River Diversion Stage 1"): Duration = 92 days.Activity 2002: Starts immediately after 2001, duration = 38 days.Activity 2003: Starts immediately after 2002, duration = 15 days.Activity 2004: Starts immediately after 2003, duration = 38 days.Calculate the Duration:Total duration = 92 + 38 + 15 + 38 = 183 days.Cross-Verification with Answer Options:Option A: Incorrect. Underestimates.Option C: Incorrect. Overestimates.Option D: Incorrect. Overestimates.Option B: Correct. Matches the calculated duration.
Theoretically construct a summary activity for activities 2001 through 2004. Using the "normal" schedule, what is the cost of the hammock?
Hammock Cost for Activities 2001–2004:Activity 2001: Cost = $150,000.Activity 2002: Cost = $25,000.Activity 2003: Cost = $20,000.Activity 2004: Cost = $96,000.Calculate Total Cost:Total cost = $150,000 + $25,000 + $20,000 + $96,000 = $271,000.Cross-Verification with Answer Options:Option B: Incorrect. Overstates cost.Option C: Incorrect. Understates cost.Option D: Incorrect. Overstates cost.Option A: Correct. Matches the calculated cost.
PSP Study Guide (2019), Section on Summary and Hammock Activities.AACE Recommended Practices, RP 10S-90.
Theoretically construct a summary activity for activities 6001 through 6003. Identify the governing predecessor and successor activities for the hammock:
Definition of a Summary Activity (Hammock): A summary activity, also referred to as a hammock activity, spans multiple detailed tasks and is governed by the earliest start (ES) of the first task and the latest finish (LF) of the last task.Activities 6001 through 6003 Overview:6001: Starts after 5001 (Drill and Grout Dam Site).6003: Ends before 8001 (Rock Fill to elevation 50).Identifying Predecessor and Successor:Predecessor: Activity 5001 (Drill and Grout Dam Site).Successor: Activity 8001 (Rock Fill to elevation 50).Cross-Verification:Logical and temporal dependencies confirm that Activity 5001 must precede the hammock, and Activity 8001 must succeed it (Ref: PSP Study Guide, Chapter 2A: Logical Sequencing and Activity Relationships
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