  We present an exploratory study comparing the visualization construction and
data exploration processes of people using two visualization tools, each
implementing a different interaction paradigm. One of the visualization tools
implements the manual view specification paradigm (Polestar) and another
implements the visualization by demonstration paradigm (VisExemplar). Findings
of our study indicate that the interaction paradigms implemented in these tools
influence: 1) approaches used for constructing visualizations, 2) how users
form goals, 3) how many visualization alternatives are considered and created,
and 4) the feeling of control during the visualization construction process.
