2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/188273A review of methods to extract the standard CKM unitarity triangle angle alpha is provided. The sizes of related theoretical errors are reviewed.6 pages, referencing improved, based on talks given at "CKM2006", Dec 12th-16th, 2006, Nagoya, Japan, and at "Beauty 2006", Sept 25th-29th 2006, Oxford, UKHigh Energy Physics - Phenomenologytext