# Peak units

• ### Question

• Hello,

Please explain how Project calculates the Peak in the following examples:

1. Fixed units Task1 duration is 2.5 days. Resource John is assigned at 100% . Work day is a default 8h.

Why does Project calculate Peak for day 3 as 100% if John works only 4h on that day which is 50% of his capacity?

2. If in the example above we manually change  the work for day 3 from 4h to 8h, Project recalculates Peak as 200% even though 8h/d is 100%. Why doe it do so?

Does this mean that Project thinks this way:

The duration of day 3 is 0.5d thus that day's Units (Peak) = Work / Duration = 4h / 05d = 100% in the first case and 8h/ 0.5d = 200% in the second?

Thank you,

Alex

Wednesday, November 2, 2016 7:28 PM

### All replies

• Hi Alex,

I can't reproduce this behavior. Can you try on a blank new file? Also which Project version do you have? Is it upgraded up to the latest patch level?

Hope this helps,

Guillaume Rouyre, MBA, MVP, P-Seller

Thursday, November 3, 2016 8:33 AM
• Alex - you have answered your own question - by editing the work on the last half day in the timephased element of the view you have asked the person to do 8 hours work in half a day thus the peak units go up to 200% - if you had edited the work value in the tabular element of the screen the duration would have increased to 3 days as it would have computed that a person working 100% would take 3 days to do 24 hours work.

I just replicated your situation and then my suggested approach and got the result I expected.

Cheers,

Dominic

Microsoft Project Evangelist

Note: Posts are provided “AS IS” without warranty of any kind, either expressed or implied, including but not limited to the implied warranties of merchantability and/or fitness for a particular purpose.

Thursday, November 3, 2016 2:01 PM
• Hi Guillaume,

You have to enter 2.5d  into the Duration field, not the Work  field.

Thank you,

Alex

Thursday, November 3, 2016 10:55 PM
• Dominic,

By saying "if you had edited the work value in the tabular element of the screen" did you mean entering 24h into the Work filed to get 3d duration?

Thank you,

Alex

Thursday, November 3, 2016 11:04 PM
• Alex, Yes if you edit the work value in the work column on the left hand side from 20h to 24h it will increase the duration from 2.5D to 3D and the resource will be assigned at 100% and have a peak units value of 100% across the revised duration.

Cheers,

Dominic

Microsoft Project Evangelist

Note: Posts are provided “AS IS” without warranty of any kind, either expressed or implied, including but not limited to the implied warranties of merchantability and/or fitness for a particular purpose.

Friday, November 4, 2016 8:14 AM
• Alex:

The peak field will always show the highest level of usage for the resource. For example, if the resource reported 9 hours of work on Tuesday, the the peak would increase to 112% - so this simply reflects the the high point of utilization. The Units field, on the other hand, retains the original assignment units value.

100% Units is the default, 100% units would then be the peak. The half day assignment you made is still at 100% The fact that the resource has four hours available to work on Wednesday has zero affect on the Units or Peak Units.

Gary Chefetz, MCITP, MCP, MVP msProjectExperts
Project and Project ServerFAQs
Project Server Help BLOG

Tuesday, November 8, 2016 1:12 PM