Assign Resources with Units = 50%

Marcos,

What you are doing "wrong" is assuming that duration equates to work. It does not. When you assign the resource to the task, that resource is only available for 4 hours on 3/1/25 so that's all he/she works.

If your intent is to have the work content at 8 hours, set the Work field value before assigning the resource. Then when you assign the resource the task will be spread over 2 days (i.e. 4 hours each day based on that resource's availability) with a start on 3/1/25 and a finish on 6/1/25.

Hope this helps.

John