  What makes speeches effective has long been a subject for debate, and until
today there is broad controversy among public speaking experts about what
factors make a speech effective as well as the roles of these factors in
speeches. Moreover, there is a lack of quantitative analysis methods to help
understand effective speaking strategies. In this paper, we propose E-ffective,
a visual analytic system allowing speaking experts and novices to analyze both
the role of speech factors and their contribution in effective speeches. From
interviews with domain experts and investigating existing literature, we
identified important factors to consider in inspirational speeches. We obtained
the generated factors from multi-modal data that were then related to
effectiveness data. Our system supports rapid understanding of critical factors
in inspirational speeches, including the influence of emotions by means of
novel visualization methods and interaction. Two novel visualizations include
E-spiral (that shows the emotional shifts in speeches in a visually compact
way) and E-script (that connects speech content with key speech delivery
information). In our evaluation we studied the influence of our system on
experts' domain knowledge about speech factors. We further studied the
usability of the system by speaking novices and experts on assisting analysis
of inspirational speech effectiveness.
