Podcast
Questions and Answers
What type of relationship arises when one activity cannot begin until another is partially or wholly completed?
What type of relationship arises when one activity cannot begin until another is partially or wholly completed?
- Physical (correct)
- Resource
- Preferential
- Safety
During which month is the Diversion Stage activity scheduled to take place?
During which month is the Diversion Stage activity scheduled to take place?
- March (correct)
- February
- May
- April
Which relationship type should be considered when two activities pose a safety hazard if performed simultaneously?
Which relationship type should be considered when two activities pose a safety hazard if performed simultaneously?
- Resource
- Preferential
- Safety (correct)
- Physical
What is the total duration for the installation of Outlet Gates?
What is the total duration for the installation of Outlet Gates?
What method can be employed to estimate the duration of an activity in construction?
What method can be employed to estimate the duration of an activity in construction?
What does the resource relationship in project sequencing primarily focus on?
What does the resource relationship in project sequencing primarily focus on?
Which activity is completed immediately before the Curtain Grout?
Which activity is completed immediately before the Curtain Grout?
What is the cumulative Work Progress Ratio after the installation of Trash Racks?
What is the cumulative Work Progress Ratio after the installation of Trash Racks?
Which of the following is NOT a recommended approach to estimate activity duration?
Which of the following is NOT a recommended approach to estimate activity duration?
How much of the total cost is allocated to Activity D?
How much of the total cost is allocated to Activity D?
What is the formula for calculating the early finish date of an activity?
What is the formula for calculating the early finish date of an activity?
During the backward pass, what does the late finish date of an activity depend on?
During the backward pass, what does the late finish date of an activity depend on?
Which definition best describes 'total float'?
Which definition best describes 'total float'?
What is the correct method to find the late start date of any activity in the backward pass?
What is the correct method to find the late start date of any activity in the backward pass?
What is free float best described as?
What is free float best described as?
How is link lag defined?
How is link lag defined?
What does Rule 4 of the forward pass state?
What does Rule 4 of the forward pass state?
What is the earliest time an activity can finish called?
What is the earliest time an activity can finish called?
What is the primary relationship utilized in the Arrow Diagram Method (ADM)?
What is the primary relationship utilized in the Arrow Diagram Method (ADM)?
Which of the following statements is true about dummy activities in PDM?
Which of the following statements is true about dummy activities in PDM?
How does the Project Duration estimation differ between ADM and PDM?
How does the Project Duration estimation differ between ADM and PDM?
In the context of the Arrow Diagram Method (ADM), what is the duration for activity E?
In the context of the Arrow Diagram Method (ADM), what is the duration for activity E?
Which option describes the total float in project management?
Which option describes the total float in project management?
Which of these activities is independent in the PDM provided?
Which of these activities is independent in the PDM provided?
Which of the following activities has the longest duration in the provided example?
Which of the following activities has the longest duration in the provided example?
What relationship types are identified in the PDM?
What relationship types are identified in the PDM?
What does an arrow represent in an arrow diagram?
What does an arrow represent in an arrow diagram?
Which path is identified as the critical path in the example provided?
Which path is identified as the critical path in the example provided?
How is the total float of an activity calculated?
How is the total float of an activity calculated?
What does a total float of zero indicate for an activity?
What does a total float of zero indicate for an activity?
What does the 'ES' in the activity table represent?
What does the 'ES' in the activity table represent?
If Activity E has a total float of 1 week, what does this imply?
If Activity E has a total float of 1 week, what does this imply?
Which activity has the longest duration in the displayed project?
Which activity has the longest duration in the displayed project?
In the example, what is the function of the nodes in the arrow diagram?
In the example, what is the function of the nodes in the arrow diagram?
Study Notes
Project Scheduling
- There are four types of relationships between activities that need to be considered when establishing the sequence of work:
- Physical: one activity must be partially or totally complete before another can start.
- Safety: simultaneous activity performance can result in safety hazards.
- Resource: limited resource availability prevents activities from using the same resource at the same time.
- Preferential: contractor preferences for sequencing activities.
Estimating Activity Duration
- Activity duration can be estimated using:
- Company historic records
- Superintendent or foreman input
- Standard estimating guides
- Labor Hour Productivity equation.
Labor-Hour Productivity Method
- This method calculates the total labor-hours required for an activity by multiplying (labor-hours/Unit) x (no. of Units).
S-Curve
- An S-curve (or progress curve) visually represents the project's planned progress over time.
- It shows the cumulative cost and work progress as a function of time.
Scheduling Computations: Forward Pass Rules
- The forward pass calculates the earliest start (ESD) and earliest finish (EFD) dates of each activity.
- Rule 1: The ESD of the first activity is 0.
- Rule 2: All activities are assumed to start as soon as possible after their predecessors are complete.
- Rule 3: EFD is calculated by adding the activity duration to the ESD: EFD₁= ESD₁ + T₁.
- Rule 4: At merge points, the ESD is the largest EFD of the preceding activities.
Scheduling Computations: Backward Pass Rules
- The backward pass calculates the latest start (LSD) and latest finish (LFD) dates of each activity.
- Rule 1: The LFD of the last activity is equal to its EFD.
- Rule 2: LSD is calculated by subtracting the activity duration from the LFD: LSD₁= LFD₁ - T₁.
- Rule 3: The LFD of an activity is the smallest LSD of the following activities.
The Float Concept
- Float (or slack) is the scheduling leeway an activity has.
- Total float (TF) is the time an activity can be delayed without delaying the project.
- Total Float Equation: TF₁ = LFD - EFD₁ = LSD, - ESD₁.
- Free float is the time an activity can be delayed without delaying a following activity or the project finish.
- Link lag is the difference between the ESD of an activity and the EFD of its preceding activity.
- Free float is determined by the minimum value of all link lags following an activity.
ADM vs. PDM
- ADM (Arrow Diagram Method) and PDM (Precedence Diagramming Method) are project scheduling methods.
- ADM: uses arrows to represent activities and nodes to represent events.
- PDM: uses boxes to represent activities and arrows to show relationships between them.
- Both methods have different ways of representing relationships between activities.
- ADM: primarily uses finish-to-start relationships.
- PDM: uses a more complex relationship system, including finish-to-start, finish-to-finish, and start-to-finish.
- ADM: is simpler in terms of total float calculation.
- PDM: offers more flexibility in estimating activity duration.
Arrow Diagram Method (ADM)
- ADM is a graphical method to represent project networks.
- It's used to:
- Estimate the total project duration.
- Calculate the total float for each activity.
- Create a bar chart to visualize the schedule.
- The critical path is the longest path in the network and determines the project's overall duration.
- Activities on the critical path have zero float.
Example 4: Arrow Diagram Method
This example demonstrates how to use ADM to calculate project duration, total float, and create a bar chart.
Example 5: Arrow Diagram Method
This example showcases how to use ADM in a project that requires more complex activity relationships.
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Description
This quiz covers essential concepts in project scheduling, including the types of relationships between activities and methods for estimating activity duration. Key topics include the Labor-Hour Productivity Method and the S-Curve, providing insights into effective project management practices.
