A major shortcoming of the TPB model has been its inability to account for the influence of past behaviour [42, 43] . Evidence from meta-analytical reviews suggests that the addition of past behaviour to the TPB explains on average 7% of the variance in intention [25] . In this study, past experience significantly predicted intention after controlling for the TPB and moral norms and left the cognitive variables of the model almost unaffected. This suggests that the TPB provides a fairly accurate description of the intention formation process considering HIV and AIDS related care delivery among Tanzanian and Sudanese students. Students decide upon care delivery for HIV infected patients mainly as a consequence of situation specific expectations of the behaviour itself and to a lesser extent because they have engaged in similar care delivery previously.