Outline                                                                  <--     --> 

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• Definition and Examples
• No Such Things as Requirements
• Validation without Requirements
• Ignorance Example: Web Service
• Ignorance Example: Email

• OpenModel: Going Beyond Modularity
• Potential Benefits
• An Email Scenario

• Which Modeling Language?
• Limitations: Accuracy, Conflicting Incentives, and Hidden Agendas
• Related Work
• Summary and Future Work