
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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The following table shows activities with duration, dependency, dependency type, and the number of workers from one small segment of a project network. Draw the segment of the network diagram and then: (a) Show the resource usage (chart) if activities A, B, and C start on day one; (b) Show the new network diagram and the resource usage (chart) when resources are leveled after applying appropriate slack times.

Transcribed Image Text:This table outlines the details of various activities within a project. Each activity is characterized by its duration, predecessors, dependency type, and the number of workers involved. Here's a detailed explanation:
| Activity | Duration | Predecessor (dependency) | Dependency Type | Number of Workers |
|----------|----------|--------------------------|-----------------|-------------------|
| A | 2 | - | D | 2 |
| B | 4 | - | D | 2 |
| C | 10 | - | M | 4 |
| D | 3 | A | D | 2 |
| E | 1 | B | D | 2 |
| F | 2 | C,D,E | M(C,E) | 4 |
### Explanation:
- **Activity**: This column lists the various tasks or activities in the project.
- **Duration**: The time each activity is expected to take. For example, Activity A has a duration of 2 units of time.
- **Predecessor (dependency)**: This shows which activities need to be completed before the current activity can begin. A dash ("-") indicates no predecessors.
- **Dependency Type**:
- "D" indicates a Direct dependency, where one activity depends on the completion of another.
- "M" indicates a Multiple dependency, where the activity may depend on more complex conditions or multiple predecessor activities.
- "M(C,E)" for Activity F signifies a dependency on the completion of Activities C and E.
- **Number of Workers**: Indicates how many workers are assigned to each activity. For example, Activity C involves 4 workers.
This table is used for project planning and scheduling, helping to allocate resources efficiently and identify dependencies between tasks.
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