Immediate Activity Description Time (days) Predecessors Excavate Lay Foundation Begin Initial Plumbing Frame Finish exterior Install HVAC Begin initial electric Install sheet rock B C 4 A 3 B D E 10 8 4 F D 6 8 H C,E,F,G Install cabinets Paint interior Finish/Final Plumbing Final electric Install flooring J K 4 2 J K,L M 4

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I'm having trouble creating a project network diagram. I don't understand calculating the time and total slack for each activity using forward pass and backward pass. Please explain how to draw and calculate a project network diagram.

### Construction Project Activity Table

The table below details the different activities involved in a construction project, along with their descriptions, time estimates in days, and immediate predecessors necessary for each activity to begin.

| Activity | Description            | Time (days) | Immediate Predecessors |
|----------|------------------------|-------------|------------------------|
| A        | Excavate               | 3           | -                      |
| B        | Lay Foundation         | 4           | A                      |
| C        | Begin Initial Plumbing | 3           | B                      |
| D        | Frame                  | 10          | B                      |
| E        | Finish exterior        | 8           | D                      |
| F        | Install HVAC           | 4           | D                      |
| G        | Begin initial electric | 6           | D                      |
| H        | Install sheet rock     | 8           | C, E, F, G             |
| I        | Install cabinets       | 5           | H                      |
| J        | Paint interior         | 5           | H                      |
| K        | Finish/Final Plumbing  | 4           | I                      |
| L        | Final electric         | 2           | J                      |
| M        | Install flooring       | 4           | K, L                   |

#### Explanation of Columns:

- **Activity**: Each activity is represented by a unique letter (A to M) for easy reference.
- **Description**: This provides a brief summary of what each activity entails.
- **Time (days)**: The estimated duration required to complete each activity in days.
- **Immediate Predecessors**: These are activities that must be completed before the current activity can begin. For some activities, multiple predecessors are listed.

#### Key Points:

- The sequence starts with the excavation work (Activity A) and progresses through various stages of construction.
- The immediate predecessors column is crucial for understanding the dependencies between activities.
- Activities like installing the sheet rock (H), which require multiple earlier activities (C, E, F, and G) to be completed before beginning, highlight how some tasks are interrelated.
- Critical activities such as framing (D) and painting the interior (J) also serve as predecessors for subsequent work, emphasizing their importance in the project timeline.

This table serves as a project management tool to plan and coordinate the construction process effectively by delineating the sequence and duration of tasks.
Transcribed Image Text:### Construction Project Activity Table The table below details the different activities involved in a construction project, along with their descriptions, time estimates in days, and immediate predecessors necessary for each activity to begin. | Activity | Description | Time (days) | Immediate Predecessors | |----------|------------------------|-------------|------------------------| | A | Excavate | 3 | - | | B | Lay Foundation | 4 | A | | C | Begin Initial Plumbing | 3 | B | | D | Frame | 10 | B | | E | Finish exterior | 8 | D | | F | Install HVAC | 4 | D | | G | Begin initial electric | 6 | D | | H | Install sheet rock | 8 | C, E, F, G | | I | Install cabinets | 5 | H | | J | Paint interior | 5 | H | | K | Finish/Final Plumbing | 4 | I | | L | Final electric | 2 | J | | M | Install flooring | 4 | K, L | #### Explanation of Columns: - **Activity**: Each activity is represented by a unique letter (A to M) for easy reference. - **Description**: This provides a brief summary of what each activity entails. - **Time (days)**: The estimated duration required to complete each activity in days. - **Immediate Predecessors**: These are activities that must be completed before the current activity can begin. For some activities, multiple predecessors are listed. #### Key Points: - The sequence starts with the excavation work (Activity A) and progresses through various stages of construction. - The immediate predecessors column is crucial for understanding the dependencies between activities. - Activities like installing the sheet rock (H), which require multiple earlier activities (C, E, F, and G) to be completed before beginning, highlight how some tasks are interrelated. - Critical activities such as framing (D) and painting the interior (J) also serve as predecessors for subsequent work, emphasizing their importance in the project timeline. This table serves as a project management tool to plan and coordinate the construction process effectively by delineating the sequence and duration of tasks.
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