The Sims 4 at GDC Interactions presentation
The presentation shows how Concurrent Interactions (multitasking) works. It is just the PowerPoint slides and quite technical. I think they recorded the presentation and that it will be freely available soon. I do want to point a picture that were in the presentation.
I find it interesting that it is (I think) that entire can focus on the tv, standing or sitting! Rest of the pictures can be found here .