Effort driven Task, and fixed work! How they fits together?


I got a message from one of my Blog readers. Here it is

“Dear Sir,
I got confused in this topic.
according to Effort Driven definition, to have a “constant Work value”, there would be compensation between Duration and Unit when one of them changes. which means(my idea) to keep Work value fixed, when Duration(Unit) changes, Unit(Duration) will change automatically. Now the question is: when I create a task which is Effort Driven, I also select the task type as fixed Duration. Now when I change units, I will have changes in Work value(as it is fixed Duration) which has contradiction with the Effort Driven definition which says “Constant Work value”
I do appreciate if you clarify the issue.”

OK. What does Effort Driven mean? It means MORE HAND LESS WORK!

The Relation between Units, Duration and Task is: DURATION * UNITS = WORK

So, of course, if I have a fixed duration, and when I change Units, the work will be changed! If you want to have fixed hours (work), than you should mark your Task as Fixed work. Let me show you that:


OK! Now I will choose this:


and then click:


Now I am going to add two resources:


And I will assign John to the Task!


You can see there is work = 24 hours, and Units = 100%

I will change, for instance, units from 100% to 50%


and I will get:


and you can see, that Duration is changed, according to the formula: DURATION * UNITS = WORK, e.g. Duration * Units 50% (4 hours per day) = 24 hours Fixed work –> Duration = 24/4 = 6 days!

So, my dear Blog Reader If you want to make work as a constant choose Fixed work for the Task, or Tasks

Now the announcement for my next Post. If I change Duration from 3 days to 5 days you will get:


I will get:


Work, and Units are unchanged, and that SEEMS LIKE A BUG, BUT IT IS NOT! Read my next post for that!

Back to effort and non effort driven Tasks:


When you Fixe work Task, it is always Effort driven!

Now I will assign Mary to the Task:


As you can see, I still need 24 hours of Work for the Task, but since I have Mary on board, both John and Mary will spent less hours on this Task. And that is what effort driven means. And you can see effects of Effort Driven Task when you add or remove a resource/resources to/from Tasks.

I hope that my blog reader will find this Post useful!

For some more examples read this:







About Nenad Trajkovski

Location: Zagreb, Croatia Occupation: Project Manager Interests: Project Management and MS PROJECT He was born in Zagreb, Croatia at 1963. After completing his college he started working on projects in different business areas (banking, manufacturing, automotive industry, distribution, oil companies, etc.) developing and implementing ERP systems into different companies. He has got a lot of experience working with people in different business processes and also possesses great knowledge in information technologies and financial services. Today he works as a business consultant, adn Project Manager in PERPETUUM MOBILE d.o.o. Zagreb. He is a regular lecturer for Project Management in MS Innovation Center in Varaždin, Logosoft Sarajevo in Bosnia and Herzegovina and SEAVUS GROUP in Skopje Macedonia. He was named the best lecturer of WINDAYS 2008 while his lecture was also voted as the best. In addition, he was in TOP 10 lecturers at the MS SINERGY 2009 and MS VISIA 2009, 2010. Shares first place as the best lecturer of KulenDays 2009 and 2010 and PMI Conference 2009 in Zagreb. He is also a regular lecturer in the MS Community. He is a Certified Accountant and a PMP (Project Manager Professional) and a PMI-RMP (Risk Manager Professional), MCP, MCT, and Microsoft Certified Technical Specialist - Microsoft Project 2010. From 01.01.2012 awarded with MVP (Microsoft Most Valuable Proffesional - Microsoft Project)!
This entry was posted in Uncategorized. Bookmark the permalink.

6 Responses to Effort driven Task, and fixed work! How they fits together?

  1. Abhishek says:

    Is there any need to change mode in Tools->option->schedule-> for new task are effort driven?

  2. Ronel Pienaar says:

    Please assist. When I insert a subproject (Title: Primary Heat Exchanger) into my Master Schedule, it inserts the project but doesn’t give it the same saved name in the Master Schedule. Why does this happen?

    • Nenad Trajkovski says:

      What do you mean by “title”? You save your project with the name: “Primary Heat Exchanger.mpp”?

      • Ronel Pienaar says:

        Yes, I save the sub project with title “Primary Heat Exchanger.mpp”. But when I insert the sub project into my Master Schedule, it reads as follows:
        Project Template_Blank draft (this being the 1st level of the sub project)
        Primary Loop Heat Exchanger Manufacturing

  3. Diaa Abidou says:

    I really appreciate the effort performed in your highly informative posts, however, what about creating a Facebook page lively updating with your newest topics ?

    I think this is much easier for your fans to follow your newly released topics.


Leave a Reply to Abhishek Cancel reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s