CONSTRUCTION MANAGEMENT || CH : 02 Fundamentals of Network || Lecture : 04 Dummy Activity

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Video Description : In project management and construction scheduling, a "dummy activity" is a term used to represent a logical relationship between two activities that doesn't involve the actual consumption of resources or time. Dummy activities are introduced to clarify and illustrate the sequence of tasks when using network diagrams, particularly in methods like the Critical Path Method (CPM) or Program Evaluation and Review Technique (PERT).

Here are some key points about dummy activities:

1. *Purpose:*
Dummy activities are used to depict logical relationships between real activities in a network diagram.
They help in illustrating the precedence or dependency relationships between activities without representing an actual physical task.

2. *Representation:*
Dummy activities are usually represented as dashed lines or arrows in a network diagram.
They don't have a duration or resource requirements since they don't correspond to any real work.

3. *Types of Relationships:*
Dummy activities are commonly used to show finish-to-start relationships, where the start of the successor activity depends on the completion of the predecessor activity.
They may also represent other types of dependencies, such as finish-to-finish or start-to-start, depending on the scheduling requirements.

4. *Example:*
Suppose Activity A must finish before Activity B can start. In a network diagram, a dummy activity (represented as a dashed line) may be used to show this relationship. The dummy activity has no time or resource impact; it's simply a visual aid.

5. *Critical Path Analysis:*
Dummy activities are considered in critical path analysis to determine the overall project duration and identify the critical path.

6. *Limitations:*
While dummy activities help in illustrating dependencies, they are artificial constructs and do not represent real work, which may lead to confusion.

Dummy activities are a tool used to enhance the clarity and accuracy of project scheduling diagrams, allowing project managers and stakeholders to understand the sequence of activities in a project.

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