  The temporal dynamics of quantitative metrics or key performance indicators
(KPIs) are central to decision making within enterprise organizations.
Recently, major business intelligence providers have introduced new
infrastructure for defining, sharing, and monitoring metric values. However,
these values are often presented in isolation and appropriate context is seldom
externalized. In this design study, we present RemixTape, an application for
constructing structured narratives around metrics. With design imperatives
grounded in an formative interview study, RemixTape provides a hierarchical
canvas for collecting and coordinating sequences of line chart representations
of metrics, along with the ability to externalize situational context around
them. RemixTape incorporates affordances to semantically align and annotate
juxtaposed charts and text, as well as recommendations of complementary charts
based on metrics already present on the canvas. We evaluated RemixTape in a
user study in which six enterprise data professionals reproduced and extended
partial narratives, with participants appreciating RemixTape as a novel
alternative to dashboards, galleries, and slide presentations for supporting
conversations about metrics. We conclude with a reflection on how aspects of
RemixTape could generalize beyond metrics, with a call to define a conceptual
foundation for remixing in the context of visualization.
