Abstract
Usability is a key concern in the development of verification tools. In this paper, we present an usability extension for the verification tool ESC/Java2. This enhancement is not achieved through extensions to the underlying logic or calculi of ESC/Java2, but instead we focus on its human interface facets. User awareness of the soundness and completeness of the tool is vitally important in the verification process, and lack of information about such is one of the most requested features from ESC/Java2 users, and a primary complaint from ESC/Java2 critics. Areas of unsoundness and incompleteness of ESC/Java2 exist at three levels: the level of the underlying logic; the level of translation of program constructs into verification conditions; and at the level of the theorem prover. The user must be made aware of these issues for each particular part of the source code analysed in order to have confidence in the verification process. Our extension to ESC/Java2 provides clear warnings to the user when unsound or incomplete reasoning may be taking place.
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