Assignment Units VS. Peak Units in MS PROJECT 2010

Hi,

as you know the Magic formula is DURATION * UNITS = WORK!

But there is a change in MS PROJECT in representing this field.

I made a setup for this Post! I have three Tasks, each of them has one Resource assigned. Task 1 is Fixed Unit, Task 2 is Fixed Work, and Task 3 is Fixed Duration.

I will change each of this Values (Units, Work, and Duration), for each Tasks type. Notice that I put additional field in Task Usage View, called Peak:

image

First I will make changes for Task 1.

I will change Duration from 2 days to 4 days an I will get:

image

According to formula, Units are fixed so Duration * Units = Work, e.g. 4 days (4*8 hours per day = 100% * 32 hours). So Work is changed from 16 to 32 hours.

I will change Work from 16 to 24 hours now, and I will get:

image

According to formula, Units are fixed so Duration * Units = Work, e.g. Duration *100% = 24 hours = 24 hours / 8 hours per day = 3 days. So Duration is changed from 2 to 3 days.

I will change Units from 100% to 200%, and I will get:

image

According to formula, Duration * Units = Work, e.g. Duration * 200% = 16 hours = 16 hours / 200% = 8 hours = 1  day, because Resource will work with 200% capacity instead of 100% . So Duration is changed from 2 days to 1 day.

 

Now I will make changes for Task 2 (Fixed work).

I will change Duration from 2 days to 4 days an I will get:

image

You may notice something that looks like a bug, but it is not! Duration * Units = Work. Duration = 4 days (e.g. 4 days * 8 hour per days = 32 hours). Units = 100%, work = 16 hours. So 32 hours (duration) * 100% = 16 hours! Is this a bug? NO! Microsoft Project 2010 keep the unit field the same, but calculates with Peak Field! Because I have fixed work (16 hours), and I put 4 days in duration field, the formula is Duration * Peak Units = Work.  4 days (4 days * 8 hours per day = 32 hours) * 50% (Peak Units) = 16 hours of work!

Why is that? Because when you change duration you do not want to change Units from 100% to 50% for other Task, but just for this particular one! And that is why in MS PROJECT 2010 introduce the Peak field.

Same thing will happens if I change Work from 16 hours to 32 hours in Task 3 (fixed Duration type):

image

Duration * Units = Work. Duration = 2 days (e.g. 2 days * 8 hour per days = 16 hours, and it is fixed). Units = 100%, Work = 32 hours. So 16 hours (duration) * 100% = 32 hours! Peak field is 200%! Because I have fixed Duration (2 days * 8 hours per day = 16 hours), and I put 32 hours in the Work field, the formula is Duration * Peak Units = Work. 2 days (2 days * 8 hours per day = 16 hours) * 200% (Peak Units) = 32 hours of work!

So don’t be confused it the Unit field remains the same. Always look at the Peak field!

Regards,

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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 MICROSOFT PROJECT, Microsoft PRoject 2010, MS PROJECT 2010, PMI, PRoject Management and tagged , , , , , . Bookmark the permalink.

One Response to Assignment Units VS. Peak Units in MS PROJECT 2010

  1. Hasan Burak Basar says:

    Hi Mr. Trajkovski,

    Firstly, Thank you very much for your effort on this blog. It is very helpful for us to understand and use the MS Project effectively.

    Well, my comment is about the visual reports. In the subject of “budget & costs” could you please add the proper usage of visual reports, like “earned value overtime report”, “resource work availability”. Sometimes usage of these reports will make our projects more comprehensible.

    Regards.

    Hasan Burak BASAR

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