Hi,

today I will show you what happens if you assign resource to the Task, and afterwards put, for example, day off for that Resource in MS PROJECT 2016

First, I’m going to create simple Project:

I will now create John, as Resource, with 100% Max.units:

Finally I will assign John to the Task, and I will show Task Usage View:

Now I’m going to show additional Column, Type:

Now, everything is set. Suppose that at Thursday John can’t work at the Task. I will now put Day off:

and I will get:

So, with Fixed Units, End date will be Monday, 8.02.2016, and Work will remain 40 hours. The same thing will happens if you use Fixe Work Task Type, so I’m not going to show you that. If you do not believe me, try it

Now I am going to put it all back and set Task Type as Fixed Duration:

Now I’m going to set Thursday, 04.02.2016, as a Day off for John:

and, after I will click at OK button I will get:

If I click on Show Help button, I will get:

The final result is:

So, what it this post all about? About warning! As you can see with Fixed Duration, and Fixed work Task Type, there is no warning that Duration will change. If Task Type is Fixed Duration then, and only then, you will get warning that Duration is going to change.

But this is not all. Let’s say that I have five Tasks, all Fixed Duration and five different Resources assigned to those Tasks:

Now, suppose that, for some reason, Thursday is day off for all Resources, e.g. for whole company:

After I click at OK button I will get:

As you can see, in this scenario there is no warning at all. So, you have to be very, very careful when you are adding exceptions to your Calendars because the whole Schedule can “dance”, e.g. change, without warning. My suggestion is: Always have Test instance of your Project, and only after you are 100% sure that you get result which is acceptable, do changes at real Project file.

Regards!