In this paper we propose a visual user interface for formulating Boolean queries over a CASE repository. The
work is motivated by the successful adoption of the visual query paradigm in the conventional database area.
With its graphical query representation system, such a query system could ease the useres tasks of formulating
database queries when compared with linear textual query representations. In this paper, we describe the
adopted human-computer interaction techniques in this visual query interface. Specifically, we illustrate those
features that seek to solve "CASE-specific" query tasks, or that are distinct from other visual query systems.
We show how with this query interface the user can easily formulate arbitrary Boolean queries over a CASE