Logical dependencies are a type of relationship between two activities in a project. They indicate that one activity must be completed before another can begin. This type of dependency is based on the logical flow of the project, rather than on any external factors such as resource availability or other constraints.
Logical dependencies are also known as finish-to-start (FS) relationships, and they are the most common type of dependency used in project management. In this type of relationship, the predecessor activity must be finished before the successor activity can start.
A simple example of a logical dependency is when a project manager needs to complete an analysis before beginning work on a design. The analysis must be finished before the design can begin, so there is a logical dependency between these two activities.
Another example is when a project manager needs to purchase materials before starting construction. The purchase must be completed before construction can begin, so there is a logical dependency between these two activities.
Using logical dependencies helps project managers ensure that tasks are completed in the correct order and that no steps are skipped or overlooked. This helps to keep projects on track and prevents costly delays or rework.
Logical dependencies also help to identify potential risks and issues early in the project. By understanding the dependencies between tasks, project managers can anticipate problems and take steps to mitigate them before they become major issues.