All has 3 dimensions in work (3D WBS), even the logical links of the schedule.
We all know that there exist logical links between tasks of type finish to start, start to start or finish to finish, but the logical links have a nature too. The links can be of nature Zones (ZBS), Products (PBS) or Activities (ABS).
Let’s take a construction project of an infrastructure of railways, and analyze the link between the tasks “Zone #1-Track-Installation” and “Zone #2-Track-Installation”, linked in Finish to start. They are of the form “Zone-Product-Activity”, and it is seen well that only the Zone differs between these two tasks. It is thus about a link of Zone nature.
Now, let’s take the tasks “Building A-Transformer-Installation” linked to the task “Building A-Cable-Installation” with a finish to start link. This time, it is the Product which differs between these two tasks, it is thus a logical link of Product nature.
Now let’s take the tasks “Building A-Transformer-Transportation” and “building A-Transformer-Installation”. This time, it is the activity which differs between these two tasks, it is thus a link of Activity nature.
The interest, it is that when a schedule is created, one will define all the logical links with method. First, one will define the links of Activity nature, then Products then Zones. As a result, even the logical connections of the schedule will be structured and the quality of schedule will be better.
