Question: When assembling stair treads and risers, is it better to have the tread tucked under the riser or have the riser tucked in between the tread and the stringer riser backing? I am inclined to think the former because that way the tread gets more framing support but the way my current stairs are assembled is the latter, hence my uncertainty. 

See picture.![enter image description here](https://i.stack.imgur.com/4Me0r.jpg)

Answer: 
We installed it so the tread goes under the riser. We installed hardwood stairs in our home and we cut the bottom of the riser at a slight angle to ensure that the front edge of the riser was always fully touching the tread so you couldn't see a gap between the riser and tread. 

I see a lot of places online that say to install the riser first and then install the tread (riser touching the stringers and tread in front of the riser), but I can't honestly think of a reason why it matters. Maybe someone else has a polarizing opinion, but I think either is fine.
Treads and risers install should start at the bottom step. First the riser and then the tread. However, on the tread you leave a 1/4 inch gap on the back edge and then install the next riser. Your riser should be at least 1/2" thick and the tread no less than 1" thick. This gives support to the back of the tread and the 1/4" gap allows for expansion.