Abstract: This study uses Ajzen’s theory of planned behaviour to predict entrepreneurial intention among 160 students in Malaysia. The purpose is to investigate the effects of its antecedents, particularly when applied to students from family business background. A new construct was also introduced to the model in examining the role of perceived behavioural control as a mediator between alertness and intention. Results indicate a strong explanatory power in this model as well as confirming a strong support on its applicability in the entrepreneurship field. The significant effects of family business background were also validated. In addition, the role of the mediator of perceived behavioural control was tested and confirmed suggesting the importance of the state of entrepreneurial alertness to intention.