In this article, we examine secondary mathematics teachers' work with resources using the Documentational Approach to Didactics lens. Specifically, we look at the resources and a teacher's scheme of use (aims, rules of actions, operational invariants, and inferences) of these resources across a set of lessons (macro-level analysis) that aim towards students' preparation for the examinations and how this use emerges in a set of three lessons on the same topic (micro-level analysis) as a response to contingent moments. We propose the terms scheming--a teacher's emerging scheme of use related to the same set of resources used for the same aim--and re-scheming, namely, shifts in such scheming. Our analysis of lesson observations and the teacher's reflections on his actions from a post-observation interview demonstrate the interplay between the stable characteristics of the scheme of use and the scheming and re-scheming in individual lessons. We conclude this article with a discussion on the methodological potential of using both macro- and micro-level analyses in the investigation of teachers' use of resources.