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About Planning Object Links

You can create links between planning objects. Creating a link indicates a dependency between two planning objects and the order in which the tasks need to be completed to meet the schedule's milestones. A task that needs to be started before another task is referred to as the predecessor to the next task. The task that needs to be completed after the predecessor task is referred to as the successor.

You can create links between tasks, milestones, summaries and link one or more tasks to a milestone. Once the tasks are complete, the milestone is met. Once all tasks and milestones are marked as complete, the summary that the tasks and milestones belong to is considered complete.

Note: A summary that is within a summary creates an automatic dependency. These two summaries cannot be linked together.

Once your schedule has links, you can calculate the critical path in the CPM Gantt. If the CPM Calculation option is on, the planning objects' scheduled dates move to correspond with the schedule being calculated.  

Types of Links

Proliance provides several types of links:

• Finish to Start: Selecting the Finish to Start link type indicates that the successor task should be started once the predecessor task is finished.
• Finish to Finish: Selecting the Finish to Finish link type indicates that the successor task should be finished at the same time that the predecessor task is finished.
• Start to Finish: Selecting the Start to Finish link type indicates that the predecessor task should be started when the successor task is finished.
• Start to Start: Selecting the Start to Start link type indicates that the successor task should be started at the same time that the predecessor task is started.

Using Lag in Links

Lag is a positive or negative value measured in days that indicates when a task should start in relation to a linked task. A positive lag value indicates a delayed start or finish while a negative value indicates an earlier start or finish.

• Finish to Start Lag: A positive lag value in a Finish to Start link indicates that the successor task can start a certain number of days after the predecessor task finishes. A negative value indicates that the successor task must start a certain number of days before the predecessor task finishes.
• Finish to Finish Lag: A positive lag value in a Finish to Finish link indicates that the successor task can finish a certain number of days after the predecessor task finishes. A negative value indicates that the successor task must finish a certain number of days before the predecessor task finishes.
• Start to Finish Lag :A positive lag value in a Start to Finish link indicates that the successor task can start a certain number of before the predecessor task finishes. A negative value indicates that the successor task must finish a certain number of days after the predecessor task starts.
• Start to Start Lag: A positive lag value in a Start to Start link indicates that the successor task can start a certain number of days after the predecessor task starts. A negative value indicates that the successor task must start a certain number of days before the predecessor task starts.