Objective. To determine the factors associated with the correct execution of breast self examination (BSE) in adult women from Tunja, Boyaca (Colombia). Methodology. Cross sectional epidemiological study, carried out in 2009 using a multi-stage randomized stratified sampling. 810 women were chosen and a survey about frequency, opportunity and technique used in the execution of the BSE was applied. Results. Life prevalence of the BSE execution was just 27.8%, out of which just 6.2% had a correct technique. The main factors found significantly associated with the correct execution of BSE were: Having learned and