Precedence Diagramming Method

Correct Answer: Represent 'windows installation' as a Start-to-Start successor of 'walls' with a lag of 75%, 'roofing' as a Finish-to-Start successor of 'walls', and 'interior painting' as a Finish-to-Start successor of both 'windows installation' and 'roofing'.

To correctly represent the dependencies: 1. **Windows Installation and Walls**: Since 'windows installation' cannot begin until the walls are at least 75% complete, this is best represented as a **Start-to-Start (SS)** relationship between 'walls' and 'windows installation' with a **lag of 75%**. This means 'windows installation' can start only after 75% of the 'walls' activity duration has elapsed. 2. **Roofing and Walls**: 'Roofing' cannot start until the walls are 100% complete. This is represented as a **Finish-to-Start (FS)** relationship between 'walls' and 'roofing', indicating that 'roofing' starts immediately after 'walls' are fully completed. 3. **Interior Painting, Windows Installation, and Roofing**: 'Interior painting' can only begin after both 'windows installation' and 'roofing' are completed. This is represented by making 'interior painting' a **Finish-to-Start (FS)** successor of both 'windows installation' and 'roofing'. This ensures that 'interior painting' starts only after both preceding activities are finished. Other options incorrectly represent the dependencies by using inappropriate relationship types or incorrect lag percentages. For example, suggesting a lag of 25% implies 'windows installation' can start when walls are only 25% complete, which contradicts the requirement of 75% completion.

Correct Answer: Activity B can start 5 days after Activity A finishes

In a Precedence Diagram, a Finish-to-Start (FS) relationship with a lag of +5 days between Activity A and Activity B indicates that Activity B can start 5 days after Activity A finishes. This is the correct interpretation because: 1. FS relationship means that the successor activity (B) can only start after the predecessor activity (A) has finished. 2. The lag of +5 days adds an additional waiting period between the finish of A and the start of B. The other options are incorrect: - Activity B starting exactly 5 days before Activity A finishes would be a Start-to-Finish relationship, not FS. - A 5-day overlap in execution would imply a Start-to-Start or Finish-to-Finish relationship with a lag, not an FS relationship. - Allowing B to start anytime within 5 days of A's completion would not accurately represent the specific 5-day lag indicated in the question. Understanding these relationships is crucial for project scheduling and determining the critical path in project management.

Correct Answer: Use Finish-to-Start (FS) between foundation and framing, Start-to-Start (SS) with 60% lag between framing and wiring, and Finish-to-Start (FS) from both framing and wiring to interior finishing.

The correct answer is to use Finish-to-Start (FS) between foundation and framing, Start-to-Start (SS) with 60% lag between framing and wiring, and Finish-to-Start (FS) from both framing and wiring to interior finishing.

This approach accurately represents the sequence of activities described in the scenario:

1. Foundation work must be completed before structural framing can begin: This is represented by a Finish-to-Start (FS) relationship between foundation and framing.

2. Electrical wiring can start when 60% of the structural framing is finished: This is represented by a Start-to-Start (SS) relationship with a 60% lag between framing and wiring.

3. Interior finishing can only commence after both structural framing and electrical wiring are fully complete: This is represented by Finish-to-Start (FS) relationships from both framing and wiring to interior finishing.

The other options are incorrect for the following reasons:

- Applying only Finish-to-Start (FS) relationships between all activities does not accurately represent the 60% lag requirement between framing and wiring.

- Using Start-to-Start (SS) relationships for all activities is incorrect because it does not properly represent the sequential nature of foundation work and framing, or the completion requirement for framing and wiring before interior finishing can begin.

- Using Start-to-Start (SS) from both framing and wiring to interior finishing is incorrect because it does not ensure that framing and wiring are completed before interior finishing begins.

The correct answer provides the most accurate representation of the project dependencies using the Precedence Diagramming Method, ensuring proper sequencing and timing of activities.