Precedence Diagram Method (PDM) - AcqNotes
In the sphere of project management, the term precedence relationship follows the fairly typical pattern of viewing what came first to determine what should come . It is a method of constructing a project schedule network diagram that uses there is a defined relationship between the start of activities. Through the use of readily available software, network schedules are fairly easy to. In order to develop our schedule, we first need to define the activities, . Gantt charts are easy to read and are commonly used to display schedule activities. show the dependency relationships (i.e., precedence network) between activities.
In other words, both activities should finish simultaneously. For example, let us say that you coding a program for a client, and the client is providing you the characteristics of the program. In this case, you cannot finish coding for your program until the client gives you his complete requirements.
Here, both activities should finish simultaneously. Start to Start SS Here, the second activity cannot be started until the first activity starts. Both activities should start simultaneously. Suppose you have to apply a primary coating on a wall.
To apply the coating, you also need to clean the wall. Therefore, one team will start cleaning the wall and second team will paint it. Both activities can be started at the same time. Start to Finish SF In this type of dependency, the second activity cannot be finished until the first activity starts. For example, let us say you have to move into a new home, and your old home has to be demolished. This type of dependency shows that two activities will start together.
For instance, in a construction project, building the mainframe of the construction will start with the procurement of materials. In this case, these activities will be shown as start-to-start dependent in the network diagram.
This type of dependency shows that two activities in a project will finish together. For instance, in a software project, during tests, bugs will be found regarding the developed software. And these bugs will be fixed by the software developers. But after that, the testing team must re-check whether the bug is really fixed.
Therefore, testing and bug fix activities are an example for finish-to-finish type of dependency in Precedence Diagramming Method. Start-to-finish dependency is a very rare type of dependency in projects. In this type of dependency, Activity B can finish only after Activity A starts.
These types of relationships can be used in just-in-time supply chain materials for example.
Activity links: How to add precedence relations between activities? | PM Knowledge Center
But, you have a threshold that if this number of components falls below 20, a new order should be placed to the supplier of the electronic component. In this case, there is a Start-to-finish dependency between the remaining number of electronic components in the warehouse and placing a new order. It is better to describe GERT here.
GERT is a modification to the network diagram drawing method allows loops between activities. Activity B has a finish-to-start dependency to the Activity A. Activity B can start only after Activity A is finished. However, after Activity B is completed, activity A is re-initiated. We can give the software development and testing as an example for this scenario.
After software development finishes in a project, testing must start. And during tests, bugs will be found. And these bugs must be fixed by the software developers. Bug fixing and re-testing will continue until all bugs of the software will be finished. This is an example for GERT.
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- Activity links: How to add precedence relations between activities?
- Precedence Diagramming Method (Activity on Node Method) in Scheduling