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Project Management/When to start successor task


Hello Frank,
I want to start task4 whenever task1 or task2 or task3 is complete.
I was not able to find the proper wording in MsProject 2007 to do this.
Can it be done?

In other word, it is like a "OR" and not a "AND" - I do not want all 3 to be complete in order to start Task4.

Thank you.

Hi , The start of the successor task depends on the logical relationship with its predecessors. If you are using a finish to start relationship between tasks 1,2,and 3 and task 4, task 4 will start after the largest early finish of the previous tasks. I suggest using an FS relationship between task 1 and task 4, task 2 and task 4, and task 3 and task 4. include the durations for each task in the task attributes. If the durations of tasks 1-2-3 are different, task 4 will start after the task with the greatest duration.

You can use a start to start relationship with lag also.

Do all 3 predecessors have the same duration? and same start date?

You may want to include a contstraint at task 4 such as "must start no later than" which may cause the result you are looking for.

It appears that you want task 4 to start after any of the 3 predecessaors is complete.I'll have to check with a few MS project experts to see if there is an option to do that.  

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Frank P. Saladis


All questions related to the Project Management Body of Knowledge (PMBOK Guide), project leadership, managing teams, dealing with difficult people, managing change, managing risk, team building, project planning, project communications, preparing for the PMP exam.


28 years with AT&T - National Project Manager 3 years Cisco Systems - Professional Services Project Management Office 18 years as a Project Management Trainer and consultant with The International Institute for Learning Featured Keynote Speaker and track presenter at international project management conferences 1993 - present

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Publications - 150 Project Leadership Articles Project Managemet World Journal Bringing the PMBOK Guide to Life, John Wiley Publishing 9th 10th and 11th edition Project Management Workbook for: Project Management - A Systems Approach,Kerzner, John Wiley Pubilishing PMI World Congress Proceedings 1993 -2012 Mastering people Skills - e-book, www, Positive Leadership in Project Management, IIL Publishing, 2013

Certfied Project Management Professional- PMP, Project Management Institute Masters Certificate - Commercial Project Management, George Washington University Leadership Institute Masters Class, Project Management Institute Certificate in Project Management - The Kerzner Approach, International Institute for Learning

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