Essential KPIs include OTIF, order cycle time, inventory accuracy, picks per hour, dock-to-stock time, return processing time, and cost per order. Require regular reports, data exports, and defined SLA remedies so scorecards drive continuous improvement and contract accountability.

Run transit-time studies and landed-cost models using sample SKUs and zone maps; request carrier time-in-transit data; validate with pilot shipments or TMS simulations; and include warehousing, handling, and reverse logistics in total landed-cost calculations to identify true cost-to-serve.

Prioritize a cloud WMS with API/EDI connectivity, real-time inventory visibility, pick/pack optimization, barcode/RFID support, climate control where required, and automation-readiness. Marketplace and carrier integrations plus scalable labor models lower unit costs and reduce lead times.

3PLs vary on storage vs. handling fees, minimums, and volume tiers. Negotiate throughput discounts, ramp periods, indexation caps, clear SLA definitions, and liability terms. Use projected volume lanes and seasonal peaks to model break-even points and secure performance-based incentives.