- In the network diagram shown in Figure 1.1 in the appendix, each node represents an activity and is labelled with the activity number and the associated completion time.
- Timing of activities and total float
- In case of starting date of project is on the 11January 2010, the end of the whole project would be 5 April 2010. The appendix in Figure 1.2 shows the earliest date with the total time required of the whole project.
- Effect on the duration of the whole project
- It would be effect on the duration of the whole project because activity P on the critical path will be delayed the completion of project. A lag of 1 day between activities P and (with a finish to start relationship) means that Q cannot start until 1 day after activity P is finished.
- It would be effect on the duration of the whole project because activity N on the critical path will be completed project 1 day ahead of time.
- It would be not any effect on the duration of the whole project because activity I is not on the critical path. Therefore, this activity can end and still allow the project to be completed on time.
- The purpose of network diagram
Early Start Time (EST): Early start Time is the earliest time the activity can begin. The earliest time at which the activity can start given that its precedent activities must be completed first.
Late start Time (LST): Late start Time is the latest time the activity can begin and still allow the project to be completed on time. Latest start time, equal to the latest finish time minus the time required to complete the activity.
Early Finish Time (EFT): Early finish Time is the earliest time the activity can end. Earliest finish time, equal to the earliest start time for the activity plus the time required to the activity.
Late Finish Time (LFT): Late finish Time is the latest time the activity can end and still allow the project to be completed on time. The latest time at which the activity can be completed without delaying the project
Float: Float is defined as the amount of time between when an activity "can start or finish" and when an activity "must start or finish".
It's easier to troubleshoot problems if the service technicians know what exists on their network, where, and how each node is connected to each other node. A network diagram provides that "Big Picture" allowing a technician to troubleshoot more quickly with a minimum amount of research.
A network diagram also helps new technicians get up to speed quickly. Instead of memorizing the network over time, a technician has a quick reference to turn to, allowing the new technician to be a productive part of the team more quickly.
As suggested by Baker et al. (2003), a "network diagram is the logical representation of activities, that defines the sequence or the work of aproject. It shows the path of a project, lists starting and completion dates and names the responsibilities for each task. That is to say how the work of the project goes together. A network for a simple project might consist one or two pages and on a larger project several network diagrams may exist".
A Network Diagram is a visual representation of a project's schedule.Well known complements to network diagrams include thePERTandGanttcharts.A network diagram in project management is useful for planning and tracking the project from beginning to finish.It represents a project's critical path as well as the scope for the project.
A good network diagram will be a clear and concise graphic representation of a project.
The task relationships are usually captured in a network diagram, as well as later in the project schedule. A network diagram (or project network diagram) is one of the best mechanisms available to help you identify task relationship in your project. By creating a visual representation of the project activities and tasks, it is much easier for you to see how they are related to each other.
In addition to highlighting relationship s among activities, here are some other advantages offered by a network diagram:
It helps to identify the time and resources for each activity
It helps to identify schedule development constraints
It identifies the critical path
It illustrates total and free float -----(PMP)---reference