Assess throughput (orders/day), SKU density, dock and cross-dock capacity, slotting strategy, and peak labor scalability. Verify WMS/ERP integrations (EDI/ASNs), SLA for order accuracy and cut-off times, parcel carrier connectivity, and value-added services such as kitting, returns processing, and temperature control.

Proximity to major highways and container yards lowers drayage and truck turnaround time, reducing cost per shipment. Local courier density and multi-carrier contracts improve parcel pricing and delivery windows. Prioritize 3PLs with demonstrated carrier relationships and routings that match your delivery SLAs.

Include clear KPIs (OTIF, accuracy, inventory shrink), chargeback terms, insurance and liability clauses, audit rights, data access (real-time inventory), and defined onboarding timelines. Also stipulate contingency plans for peak seasons and capacity scaling to avoid service degradation.