Discretionary dependencies, also known as preferential or soft logic, are a type of dependency in project management. They are used to indicate that one task is preferred to be completed before another, but it is not absolutely necessary. This type of dependency allows for more flexibility in the project timeline and can help to reduce delays.
There are two types of discretionary dependencies: finish-to-start (FS) and start-to-start (SS). With a finish-to-start dependency, the first task must be completed before the second task can begin. With a start-to-start dependency, both tasks can begin at the same time but one must be finished before the other can continue.
Discretionary dependencies provide flexibility in project planning and scheduling. They allow for tasks to be completed in any order as long as the overall timeline is met. This can help to reduce delays and ensure that tasks are completed on time. Additionally, discretionary dependencies can help to identify potential risks and issues early on in the project.