Adding connections to your scheduling project

In this post I would quickly like to introduce two types of connections that you can make with tasks in OnTime scheduling tool. There are four types of connections that you can have in project management and those are:

  • FS – Finish Start
  • SS – Start Start
  • FF – Finish Finish
  • SF – Start Finish

I have made two of these four options possible in OnTime program. Finish Start is the default connection type, which means that if we connect two tasks and we don’t specify a type it is assumed that you meant FS type, which is the most commonly used connection. It just means that when one task will finish the other one will begin. Below is the visual representation of two elements connected with FS connection.

The other type of connection that is enabled in the program is FF – Finish Finish. That means that if we connect two tasks with FF connection we are saying to the program, that both tasks have to finish at the same time. Again in the figure below we can see the FF type connection.

Having more than one connection

It is possible that you link one task with as many other tasks you like, connections can be either FS or FF. So valid connection of one task would be: 1, 2, 3 FF, 4 FS, 6.
The start date of a task with multiple connections will be calculated and set in such a way that a connection that will result in the latest finish date will prevail. (that will mean that all of the connections will be observed and the critical one will set the start and finish date of connected task). Of course anytime, you change any of the tasks (in our example 1,2,3,4 and 6) all will be calculated again and the critical connection will once prevail once again.


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  1. #1 by PM Hut on January 26, 2010 - 6:14 pm


    I have published a very long post with all the project management definitions including FF, SS, FS, SF. Here it is: Project Management Dictionary. Hope you and your readers will find it useful.

  2. #2 by Ladislav Klinc on January 26, 2010 - 6:34 pm

    this is a useful dictionary. Nice work, since I have seen your first blog comment I read your PM Hut site…keep up the good work and stay in touch

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