Chapter 9: Feature Experimentation -- 9.1 THE HYPEX MODEL -- 9.2 GENERATE FEATURE BACKLOG -- 9.2.1 Customers -- 9.2.2 Business Strategy -- 9.2.3 Bottom-up Innovation -- 9.2.4 Prioritizing the Feature Backlog -- 9.3 DEFINE EXPECTED BEHAVIOR -- 9.4 IMPLEMENTATION AND INSTRUMENTATION -- 9.5 GAP ANALYSIS -- 9.6 DEVELOP AND TEST HYPOTHESES -- 9.7 ITERATION -- 9.8 EXAMPLE -- 9.9 CONCLUSION -- Chapter 10: Evidence-Driven Development -- 10.1 A CONCEPTUAL FRAMEWORK -- 10.2 THE QCD METHOD -- 10.3 REQUIREMENTS TO HYPOTHESES -- 10.4 HYPOTHESIS TESTING TECHNIQUES -- 10.4.1 Concept Testing -- 10.4.2 A/B Testing -- 10.5 SCOPE OF DEVELOPMENT -- 10.5.1 New Product Development -- 10.5.2 New Feature Development -- 10.5.3 Feature Optimization -- 10.6 BRINGING IT ALL TOGETHER: QCD -- 10.7 EXAMPLE -- 10.8 CONCLUSION -- SECTION IV: Ecosystems -- Chapter 11: The Stairway to Heaven: Ecosystems -- 11.1 SOFTWARE ECOSYSTEMS -- 11.2 TOWARDS MANAGING COMPLEXITY -- 11.2.1 Complexity Problems During Evolution -- 11.3 THREE LAYER PRODUCT MODEL -- 11.3.1 Commoditized Functionality Layer -- 11.3.2 Differentiating Functionality Layer -- 11.3.3 Innovation and Experimentation Layer -- 11.3.4 Productization and Commoditization Process -- 11.3.5 Architecture Refactoring Process -- 11.4 VALIDATION -- 11.5 ECOSYSTEM DIMENSION -- 11.6 INTERNALLY FOCUSED -- 11.6.1 Definition -- 11.6.2 Drivers for Adoption -- 11.6.3 Ecosystem Principles -- 11.6.4 Implications -- 11.6.5 Remaining Concerns -- 11.7 AD HOC ECOSYSTEM ENGAGEMENT -- 11.7.1 Definition -- 11.7.2 Drivers for Adoption -- 11.7.3 Ecosystem Principles -- 11.7.4 Implications -- 11.7.5 Remaining Concerns -- 11.8 TACTICAL ECOSYSTEM ENGAGEMENT -- 11.8.1 Definition -- 11.8.2 Drivers for Adoption -- 11.8.3 Ecosystem Principles -- 11.8.4 Implications -- 11.8.5 Remaining Concerns -- 11.9 STRATEGIC SINGLE ECOSYSTEM -- 11.9.1 Definition