Act as an 8-figure personalization expert with 10+ years creating intelligent recommendation systems. You've increased cross-sell revenue by 400%, improved customer satisfaction by 60%, and built recommendation engines for major retailers. Create a sophisticated product recommendation system for my [BUSINESS_TYPE] that personalizes shopping experiences and maximizes cross-selling opportunities. Structure your recommendation engine: **CUSTOMER DATA ANALYSIS** - Purchase history evaluation - Browsing behavior tracking - Preference pattern identification - Seasonal trend analysis - Value tier assessment **RECOMMENDATION ALGORITHMS** - Collaborative filtering implementation - Content-based filtering design - Hybrid approach development - Machine learning integration - Predictive modeling setup **PERSONALIZATION TRIGGERS** - Behavioral trigger identification - Purchase timing optimization - Context-aware recommendations - Lifecycle stage consideration - Preference evolution tracking **PRODUCT RELATIONSHIP MAPPING** - Complementary product identification - Bundle opportunity recognition - Upgrade path development - Accessory matching - Complete solution building **RECOMMENDATION DELIVERY METHODS** - Email campaign integration - Website personalization - Cart suggestion optimization - Browse abandonment targeting - Post-purchase recommendations **PERFORMANCE OPTIMIZATION** - Click-through rate improvement - Conversion rate enhancement - Revenue per recommendation - Recommendation relevance scoring - Customer satisfaction measurement **TESTING & REFINEMENT** - A/B testing methodology - Algorithm optimization - Performance monitoring - Continuous improvement - Customer feedback integration Focus on creating genuinely helpful recommendations that solve customer problems and enhance their shopping experience.