With reference to the following network which statement is incorrect?

Explanation:

According to the above network following inferences can be drawn:

1. Event 1 is the starting event and Event 8 is the end event.

2. Event 2 precedes Event 3 and Event 4 and follows Event 2.

3. Event 3 precedes Event 5, Event 6, and Event 7 and follows Event 2.

4. Event 4 precedes Event 7 and follows Event 2.

5. Event 5 follows event 3 and precedes Event 6.

6. Event 6 precedes Event 8 and follows Event 5, Event 3, and Event 7.

7. Event 7 precedes Event 6 and follows Event 4 and Event 3.

Additional Information PERT (Program Evaluation and Review Technique)

1. Focus on Uncertainty
   PERT is used for projects where activity durations are uncertain. It uses three estimates: optimistic (O), most likely (M), and pessimistic (P), to calculate the expected duration of each activity.

2. Probabilistic Approach
   PERT is a probabilistic tool that helps in determining the probability of completing the project within a certain time frame. It is suited for research and development projects or new product launches.

3. Event Oriented
   PERT networks are event-oriented, focusing on milestones (events) in the project timeline rather than on individual activities.

4. Emphasis on Time
   The primary goal of PERT is to estimate project duration and manage time-related uncertainties rather than costs.

5. Complex Projects with High Risk
   PERT is typically used for large, complex, and non-repetitive projects where uncertainty and risk are high.

CPM (Critical Path Method)

1. Focus on Activity Duration
   CPM is used for projects with well-known and predictable activity durations. It focuses on determining the critical path, which is the longest sequence of activities in a project.

2. Deterministic Approach
   CPM uses a deterministic model where activity times are assumed to be known and fixed, making it ideal for construction or manufacturing projects.

3. Activity Oriented
   CPM networks are activity-oriented. The focus is on the sequence and duration of tasks required to complete the project.

4. Emphasis on Time and Cost
   In addition to managing project duration, CPM also considers project costs. It helps in optimizing both time and cost through techniques like crashing.

5. Suitable for Repetitive Projects
   CPM is often used in industries like construction, engineering, and production, where projects are repetitive and experience-based.