Abstract
We are developing an approach using Jackson's Problem Frames to analyse security problems in order to determine security vulnerabilities. We introduce the notion of an anti-requirement as the requirement of a malicious user that can subvert an existing requirement. We incorporate anti-requirements into so-called abuse frames to represent the notion of a security threat imposed by malicious users in a particular problem context. We suggest how abuse frames can provide a means for bounding the scope of security problems in order to analyse security threats and derive security requirements.