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However, when we use the ‘Start-to-Finish’ relationship where ‘Prepare for Interview’ is extended by two days, you can see that the plan extends backwards in time as bellow: Another example of use Locate all stock for a shop: All stock needs to be located and purchased before the grand opening week, if its decided that it will take more time to locate the stock we can plan backwards for this using the Start-to-Finish dependency type. However, in doing this, as the interview is dependent on the finish date of the preparation, the date of the interview is moved out by two days which as we know can’t happen. Well, should the interviewer decide that they want to prepare for 4 days as opposed to 2, that person would update the schedule to get the new date that they should start revising. You may be thinking “Why not just make ‘Prepare for interview’ the predecessor task, ‘Conduct Interview with Sir Paul McCartney’ the successor task, and just have a normal Finish-to-Start relationship as below. The scheduler plans two days for preparation this works well as they can see that they need to start preparation on 6/29/12.

As Sir Paul is ‘kind of a big deal’ we will assume that the date of the interview cannot move. To help explain this fully, I will use the example that the instructor gave: You can see here that the task ‘Conduct Interview with Sir Paul McCartney’ is scheduled for 7/3/12. This relationship should be used when a task can only be started once another one has finished, BUT the date of the later task cannot be moved. When the duration of ‘Ship Crane to Site’ is extended to 5 days (as below), ‘Commence Building’ takes its start date from ‘Ship Crane to Site’ as that has a later finish date than ‘Travel to Site’įinally the Start-to-Finish relationship. ‘Commence Building’ is dependent on the finish date of ‘Travel to Site’. ‘Travel to Site’ is scheduled to finish on the same date 7/5 with duration of one day. You can see in this example ‘Ship Crane to Site’ is scheduled to finish on 7/3 with a duration of 3 days.

In this example, ‘Ship Crane to Site’ and ‘Travel to Site’ are scheduled to finish at the same time, therefore ‘Commence Building’ should not commence until Both ‘Ship Crane to Site’ and ‘Travel to Site’ are complete. You may feel that a similar result could be achieved by making Task B and Task C dependent on Task A with a Finish-to-Start relationship, however using the Start-to-Start method, both tasks MUST start at the same time regardless of any other task dependency. If you look at the predecessor column you can see that Task B is only dependent on Task A, however when Task A’s duration is extended both tasks move out due to the Start-to-Start dependency. You can see in the example below that when Task A is extended, Task B and Task C move out. This dependency type can be used to represent two tasks that should commence at the same time. Once Task A is complete, Task B can commence. This is the most commonly used dependency type, and it is also the default dependency type when linking tasks in Microsoft Project.

Start-to-Finish (SF): The start date of one task drives the finish date of another.

Finish-to-Finish (FF): The finish date of one task drives the finish date of another.

Start-to-Start (SS): The start date of one task drives the start date of another.

Finish-to-Start (FS): The finish date of one task drives the start date of another.

There are 4 different types of task dependency: These tasks then need to be linked to show the relationship between them. When creating schedules in Microsoft Project the first thing that a Project Manager would typically do is to input the tasks involved in a project. I struggled to find anything online that gave a clear description so the aim of this blog is to fill that gap. The class covered something that no one had ever explained to me in a way that I truly understood the ‘Start-to-Finish’ dependency. I was recently fortunate enough to sit in on our Microsoft Project training sessions, Managing Projects with Microsoft Project.