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Informal visualization in the form of sketching and diagramming has long been an established practise of professionals working in the fields of design, architecture, and engineering. Less is known, however, about the sketching and diagramming practices of computer scientists and software developers. Through a series of interviews with computer science researchers who develop software, we probed the purpose, contexts, and media in which they created and re-created sketches and diagrams, and the ways in which these informal visualizations evolved over time. Through our analysis we created visualizations of the observed sketching and diagramming lifecycles, which can contribute to a better understanding of the roles of sketching and diagramming in software development.