  Computational notebooks are widely utilized for exploration and analysis.
However, creating slides to communicate analysis results from these notebooks
is quite tedious and time-consuming. Researchers have proposed automatic
systems for generating slides from notebooks, which, however, often do not
consider the process of users conceiving and organizing their messages from
massive code cells. Those systems ask users to go directly into the slide
creation process, which causes potentially ill-structured slides and burdens in
further refinement. Inspired by the common and widely recommended slide
creation practice: drafting outlines first and then adding concrete content, we
introduce OutlineSpark, an AI-powered slide creation tool that generates slides
from a slide outline written by the user. The tool automatically retrieves
relevant notebook cells based on the outlines and converts them into slide
content. We evaluated OutlineSpark with 12 users. Both the quantitative and
qualitative feedback from the participants verify its effectiveness and
usability.
