Thumbnail A/B Test Design System

Create a systematic thumbnail testing framework:

**Video topic:** {{video_subject}}
**Target CTR:** {{ctr_goal}}
**Current best performers:** {{top_thumbnails}}
**Audience preferences:** {{viewer_data}}

Design a comprehensive A/B testing system:

1. VARIABLE ISOLATION
- Background color variations
- Face expression options
- Text placement tests
- Object/prop inclusion
- Composition layouts

2. TEST THUMBNAIL SET (5 Versions)
Version A: [Description + reasoning]
Version B: [Description + reasoning]
Version C: [Description + reasoning]
Version D: [Description + reasoning]
Version E: [Description + reasoning]

3. TESTING PROTOCOL
- Initial test duration
- Traffic allocation strategy
- Statistical significance threshold
- Winner selection criteria

4. DOCUMENTATION TEMPLATE
- Hypothesis statement
- Variable being tested
- Results recording
- Learnings extraction

5. CUMULATIVE LEARNING SYSTEM
- Test results database structure
- Pattern recognition approach
- Channel-specific thumbnail rules
- Continuous improvement cycle