The overarching aim of this research is to find out empirically about perceptions and experiences in self-directed language learning (SDLL) among university EFL students in two different social contexts: Mainland China and Hong Kong, and to provide empirical grounding for the potential attitudinal / behavioral differences in SDLL between successful and less successful language learners. The research is composed of a quantitative survey and two qualitative case studies. The survey study aimed at discovering and comparing the overall patterns of SDLL attitudes, strategies and motivation among university EFL students in Mainland China and Hong Kong, as well as the potential interrelationships between these variables. To this end, a questionnaire was designed based a combination of theoretical input in the literature and students' initial responses in a pilot study. The case studies were designed to complement, verify and expand the findings from the survey study by focusing on examining the potential differences between successful and less successful EFL students with regard to SDLL attitudes, strategies and motivation. The survey study identified significant differences concerning the overall patterns of SDLL attitudes, strategies and motivation between mainland Chinese and Hong Kong students. With regard to SDLL attitudes, the mainland students appeared to hold a significantly stronger orientation towards learner independence in English learning, a significantly more robust sense of confidence and abilities in carrying out SDLL, and to be significantly less supportive of teacher direction in language learning. With regard to SDLL strategies, the mainland students reported a significantly greater use of metacognitive and cognitive learning strategies, whereas the Hong Kong students reported an overall significantly higher use of functional practice strategies. The two groups, however, reported generally the same low levels of social and affective strategies. With regard