Background: Common conceptions of motivation and self-regulation view them as related but distinct entities. Most research on motivation and self-regulation investigates quantitative relations between level (e.g., self-efficacy) or type of motivation (e.g., mastery goals) and level of self-regulation. Purpose: Alternatively, the current study proposes that motivation and self-regulation strategies are integrated in purpose-strategies action orientations, which are constructed through a situated and dynamic meaning-making process. Participants and Setting: The current study presents a case analysis of one Israeli ninth-grade female student who engaged in a writing task. Research Design: The qualitative case study employed mixed-methods data that included traces in the written product, microprocesses observation, stimulated-recall interview, and a general interview. Analysis sought to triangulate findings from the multiple data sources in order to construct the dynamic and situated flow of purpose of engagement and strategies. Findings: Triangulation of data from these different sources demonstrated that individual and contextual characteristics interacted to result in a dynamic flow of situated purpose-strategies actions along the student's engagement in the writing task. Conclusions: The findings suggest that the situated purpose of engagement should be an integral element in conceptions of self-regulation; that different purposes may call for different types of self-regulation; that conceptualization and investigation of motivation and self-regulation should be domain specific; and that mixed methods, as used in this article, can provide productive tools to assess the dynamic and situated process of self-regulation.