I recently conducted several short software architecture evaluations (a.k.a. assessments) according to ATAM with small teams.
Once again I was positively impressed with the outcome: Within hours (literally!) we matched current quality goals to architectural approaches,
identifiying risks and non-risks... without even starting any tool...
So - just in case you need an overview of your architectural risks - go
and learn ATAM (for German readers: there's a free pdf on my website)
Give yourself (or your team) at least a day for an extensive evaluation -
half of which you will need to brainstorm and investigate your stakeholders' current quality goals.