Warehouse Labor Planning Model

Help me develop a warehouse labor planning model. Our operation:

Warehouse functions: [Receiving, putaway, picking, packing, shipping]
Current headcount: [Number of associates by function]
Volume patterns: [Daily, weekly, seasonal variations]
Productivity standards: [Units per hour by function]
Labor flexibility: [Permanent, temp, cross-training]
Labor costs: [Hourly rates, overtime rules]
Service level requirements: [Same-day ship cutoffs, etc.]
Absenteeism rate: [Historical %]

Please develop:
1. Demand-driven staffing model
2. Productivity measurement framework
3. Shift scheduling optimization
4. Flex labor strategy
5. Cross-training matrix
6. Overtime management approach
7. Performance incentive structure