This thesis is concerned with scenario-based evaluation method for the software usability. A scenario-based evaluation method for software usability is known as a powerful tool to understand the user and system. However, the methodology tends to have limitations such as incompleteness and system-dependency, and is usually not systematic. A systematic approach is needed for generation of scenarios which can represent all important system functions in order to pursue completeness in evaluating software usability with scenarios. This study suggests a scenario-based evaluation method for the software usability employing the abstraction structure which represents work system structure. The methodology is effective due to its systematic process.