I was reading about some builds on the official PoE forums and I noticed that a criterion is

Atz: Atziri Viable

 

U-Atz: Uber Atziri viable

 

U-Lab: Uber Lab viable

I am familiar with what "Atziri/Uber Atziri" refer to (and I suppose that "Uber Lab" is just another map).

My question is: are there objective criteria to decide if a build is viable or not for those maps?

If yes, what are these?

I was reading about some builds on the official PoE forums and I noticed that a criterion is

Atz: Atziri Viable

U-Atz: Uber Atziri viable

U-Lab: Uber Lab viable

I am familiar with what "Atziri/Uber Atziri" refer to (and I suppose that "Uber Lab" is just another map).

My question is: are there objective criteria to decide if a build is viable or not for those maps?

If yes, what are these?