The adaptive use case methodology for software development proposed by Carlson and Hurlbutt [2,4] forms the backdrop for this paper. Their methodology integrates the software design, development and testing processes through a series of design preserving, algorithmic transformations. This paper focuses on the software testing metrics used in the generation of object oriented test plans as part of that methodology. During the design phase, interaction diagrams are developed from which use case action matrices are then generated. A use case action matrix contains a collection of related scenarios each describing a specific variant of an executable sequence of use case actions. The proposed software testing metrics are employed to improve the productivity of the testing process through scenario prioritization.