What do the dashed and solid lines in the network plan diagram represent?

Solid line: No matter which plan it is, it will contain a lot of work to be completed. In our network plan diagram, work is represented by arrows. The tail of the arrow indicates the beginning of work, and the arrow indicates the completion of work.

The direction of the arrow indicates the forward direction of the work (from left to right). Any arrow line takes up time and consumes resources. The name or content of the work is written above the arrow line, and the duration is written below the arrow line.

Dotted line: It is a virtual work that does not exist in actual work, so it usually does not occupy resources or consume time. The working hours it represents are zero, and it is fictitious work that does not consume any resources. Its function is only to correctly represent the logical relationship between work.

In a network diagram, the path that starts from the starting node, passes through a series of arrows and nodes in the direction of the arrow, and finally reaches the end node is called a line. Among each line, one or several lines have the longest total time and are called critical lines. They are generally represented by double lines or thick lines. The other lines are shorter than the key lines and are called non-critical lines.

Extended information:

1. The network planning method originated in the United States and is an important method of project plan management. Types of network plans:

1. Single code name network plan;

2. Dual code name network plan;

3. Dual code name time stamp network plan; < /p>

4. Single codename overlapping network plan.

2. Single-code network diagram

1. Node: Each node in the single-code network diagram represents a piece of work, and the nodes should be represented by circles or rectangles. The job name, duration and job code represented by the node should be indicated in the node. Nodes in a single-code network diagram must be numbered.

The number is indicated in the node. The number can be interrupted, but repetition is strictly prohibited. The number of the tail node of the arrow line should be smaller than the number of the arrow node. A job must have a unique node and a corresponding number.

2. Arrow lines: The arrow lines in the single-code network diagram represent the logical relationship between adjacent tasks, which neither takes up time nor consumes resources. The arrow line should be drawn as a horizontal straight line, broken line or diagonal line. The horizontal projection direction of the arrow line should be from left to right, indicating the direction of work progress.

The logical relationships between jobs include the organizational relationships of process relationships, which are represented in the network diagram as the sequence of jobs.

3. Lines: In a single-code network diagram, each line should be represented by the number of the node on the line from small to large.

Reference material: Baidu Encyclopedia-Network Plan

Reference material: Baidu Encyclopedia-Network Plan Diagram