Project Scheduling and Duration Estimation
34 Questions
0 Views

Project Scheduling and Duration Estimation

Created by
@FoolproofPoincare

Podcast Beta

Play an AI-generated podcast conversation about this lesson

Questions and Answers

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?

  • March (correct)
  • February
  • May
  • April

    • 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?

    <p>1 month</p> Signup and view all the answers

    What method can be employed to estimate the duration of an activity in construction?

    <p>Using historic records alongside labor-hour productivity calculations</p> Signup and view all the answers

    What does the resource relationship in project sequencing primarily focus on?

    <p>The availability of limited resources for concurrent activities</p> Signup and view all the answers

    Which activity is completed immediately before the Curtain Grout?

    <p>Spillway Bridge</p> Signup and view all the answers

    What is the cumulative Work Progress Ratio after the installation of Trash Racks?

    <p>28%</p> Signup and view all the answers

    Which of the following is NOT a recommended approach to estimate activity duration?

    <p>Relying on anecdotal evidence from crew members</p> Signup and view all the answers

    How much of the total cost is allocated to Activity D?

    <p>6.9%</p> Signup and view all the answers

    What is the formula for calculating the early finish date of an activity?

    <p>EFD₁ = ESD₁ + T₁</p> Signup and view all the answers

    During the backward pass, what does the late finish date of an activity depend on?

    <p>The smallest late start value of its following activities</p> Signup and view all the answers

    Which definition best describes 'total float'?

    <p>The leeway time an activity has before it impacts the overall project completion</p> Signup and view all the answers

    What is the correct method to find the late start date of any activity in the backward pass?

    <p>LSD₁ = LFD₁ - T₁</p> Signup and view all the answers

    What is free float best described as?

    <p>The time span an activity may occur without delaying the project finish or following activities</p> Signup and view all the answers

    How is link lag defined?

    <p>The difference between the early start date of an activity and its early finish date</p> Signup and view all the answers

    What does Rule 4 of the forward pass state?

    <p>At merge points, the early start is the largest value of the preceding early finish time</p> Signup and view all the answers

    What is the earliest time an activity can finish called?

    <p>Early finish date (EFD)</p> Signup and view all the answers

    What is the primary relationship utilized in the Arrow Diagram Method (ADM)?

    <p>Finish-to-Start</p> Signup and view all the answers

    Which of the following statements is true about dummy activities in PDM?

    <p>Dummy activities are used to simplify relationship representation.</p> Signup and view all the answers

    How does the Project Duration estimation differ between ADM and PDM?

    <p>PDM uses a more complex set of relationships.</p> Signup and view all the answers

    In the context of the Arrow Diagram Method (ADM), what is the duration for activity E?

    <p>5 weeks</p> Signup and view all the answers

    Which option describes the total float in project management?

    <p>Total float is the amount of time a project can be delayed without affecting its deadline.</p> Signup and view all the answers

    Which of these activities is independent in the PDM provided?

    <p>Activity D</p> Signup and view all the answers

    Which of the following activities has the longest duration in the provided example?

    <p>Activity D</p> Signup and view all the answers

    What relationship types are identified in the PDM?

    <p>Various relationships including Finish-to-Start, Finish-to-Finish, and Start-to-Finish</p> Signup and view all the answers

    What does an arrow represent in an arrow diagram?

    <p>An activity</p> Signup and view all the answers

    Which path is identified as the critical path in the example provided?

    <p>A-B-D-F-H</p> Signup and view all the answers

    How is the total float of an activity calculated?

    <p>Late Finish - Early Finish</p> Signup and view all the answers

    What does a total float of zero indicate for an activity?

    <p>The activity has no flexibility in scheduling</p> Signup and view all the answers

    What does the 'ES' in the activity table represent?

    <p>Early Start</p> Signup and view all the answers

    If Activity E has a total float of 1 week, what does this imply?

    <p>Activity E can be completed a week later than planned without affecting the project.</p> Signup and view all the answers

    Which activity has the longest duration in the displayed project?

    <p>Activity D</p> Signup and view all the answers

    In the example, what is the function of the nodes in the arrow diagram?

    <p>To represent events</p> Signup and view all the answers

    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.

    Studying That Suits You

    Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

    Quiz Team

    Related Documents

    Project Management L4W6 PDF

    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.

    More Like This

    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser