This paper aims to explore the strategic learning efforts and future vision of a group of Arab postgraduate students studying in a British University while writing a dissertation in English (about 15,000-20,000 words). It is guided by Dörnyei's [2009. "The L2 Motivational Self System." In "Motivation, Language Identity and the L2 Self," Chapter 2, edited by Z. Dörnyei and E. Ushioda, 9-42. Bristol: Multilingual Matters] concept of 'possible selves', and Hajar's [2016. "Motivated by Visions: A Tale of a Rural Learner of English." "The Language Learning Journal" 1-17. doi:10.1080/09571736.2016.1146914.] distinction between compulsory and voluntary strategies. Semi-structured interviews with each participant were used to collect data. The data suggest that the participants' language learning goals and associated strategy use for writing a dissertation were essentially influenced by the practices of their dissertation supervisors, who seemed to adopt a 'dynamic assessment' approach. The adoption of dynamic assessment by most supervisors helped the participants to strengthen the vision of their ideal L2 self, and make their goals clearer and more specific. From this qualitative study, practical recommendations to develop the effectiveness (quality) of Masters dissertation supervision at UK universities were made, and areas for ongoing research were suggested.