This study examined whether the factors influencing a woman's intention to get a mammogram differ between women who have had mammograms in the past (prior screenees) and those who have not (nonscreenees). Responses to a survey were used to predict mammography intentions separately for two groups of women: those with no previous mammograms and those with one. Among the prior nonscreenees, the variables we examined accounted for nearly half the variance in intentions; among the prior screenees, only one-sixth of the variance was accounted for. This suggests that interventions that succeed in increasing mammography utilization among prior nonscreenees may not necessarily be successful among prior screenees.