In this paper I propose research in using scenarios to evaluate design changes in deficiency-driven design. I describe a method of deficiency-driven design and show how scenarios can be used in that design method. I state a question of evaluation in terms of scenarios and examine some planning techniques that are useful in addressing that question.
Relevant planning techniques include analysis of event dependencies, abstraction, localization and decision-theoretic planning. I describe work by several researchers in these areas and discuss issues that arise in applying that work to design evaluation. In particular I look at the problem of evaluating changes in terms of their generality and interactions with previous changes.