Communication skills are highly sought after by employers, as industry reports repeatedly show. At the same time, those reports also reveal that many employers are dissatisfied with their newly hired graduates' communication skills. In addition, increasing globalisation has led to the call for 'global graduates' who can function well in culturally diverse contexts. Considering both aspects, it is important, to explore which factors help foster students' global communication skills. This paper investigates this issue, testing the impact of potential factors identified from previous literature. Data was collected from 2359 students in seven different institutions located in five different countries. A linear regression model was tested to identify those factors which most contribute to global communication skills development. Results show that motivation to improve communication skills and the experience of social and academic integration into the campus community made the most significant contribution to participants' higher levels of global communication skills development. Besides, students who were presented with relevant opportunities and support from their respective institution and those engaged with foreign languages also demonstrated higher levels of global communication skills development. The paper concludes that for students to acquire the communication skills needed for working successfully in diverse contexts, and hence to become 'global graduates', it is essential that they venture out of their comfort zones and engage with the diverse campus community. At the same time, this engagement requires universities' guidance and support to help maximise the learning gains from such intercultural encounters.