Motivated by the increasing significance of information technology (IT) in today's open system organisations, the objective of this research is to uncover the relationships between business executives and their IT counterparts, which are essential toward improving organisational performance. In the process, a structural equation modelling is utilised to analyse the responses of a sample of 141 Portuguese executives. The results of testing the nine research hypotheses tend to underscore the significance of the trust between business and IT executives. Such trust is capable of fostering an organisational culture, which is conducive to the enhancement of the organisational performance. The ability of these business and IT executives to work together cultivates a knowledge domain, which generates effective solutions and applications to organisational problems. In turn, this contributes to improving the competitive performance of the organisation.