This volume, the seventh in the Transactions on Aspect-Oriented Software Development series, assembles nine papers that all apply different aspect-oriented modeling techniques to the same case study. The case study, a relatively complex crisis management system, is presented in detail in the first paper. In this way, a wide variety of notations and abstraction techniques for modeling aspect systems are demonstrated and evaluated for the same case study, allowing readers to understand the relative strengths of each approach and encouraging cross-fertilization among the techniques.