2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/132602This is an opening talk for the workshop and is intended to be provocative. We take a stab at the following questions: How well do we really know the sides of the unitarity triangle? What else could we do to improve? (I propose several new measurements). What precision should we ultimately aim at in the determination of CKM elements? What have we learned so far about flavor physics? Where do we go from here?Talk presented at 4th International Workshop on the CKM Unitarity Triangle, December 12-16, 2006, Nagoya, Japan; latex, 6 ppHigh Energy Physics - Phenomenologytext