This case study examined the adaptivity of learning transfer from an English for general academic purposes course to different disciplinary writing contexts. Data were collected at the end of one academic semester from 7 students of engineering disciplines enrolled in the writing course. Their EGAP writing course lasted for 16 weeks over which they were taught The St. Martin's Handbook, 6th Edition. The participants’ disciplinary writings together with interview transcripts served as the data sources for the extraction of adaptive transfers and also the processes of realizing the transfers. Adaptive transfers were identified by participants. Findings indicated that learning outcomes can transfer adaptively through a variety of processes to accommodate to the new writing demands. The results showed that the participants could adapt their learning along two broad dimensions of transfer, ‘idea generation’ (IG) and ‘text construction’ (TC) with the former involving ‘explication’ and ‘integration’ of knowledge and the latter achieved at macro and micro level. Within these adaptive transfers, we found a range of writing issues pursued including ‘goals, topics, logics, propositions, integrity, disciplinarity, linearity, paragraphing and linguistic resources’. Furthermore, the findings displayed two broad categories of ‘higher order’ and ‘lower order’ processes employed for the realization of adaptive transfers. While higher order processes operated through ‘transformative and evaluative’ mechanisms, the lower order processes involved two categories of ‘avoidance and affordance’, with the former as an attempt to refrain from going wrong and the latter as an effort to generate adaptivity. The findings for L2 writing are theoretically discussed.