Prioritize on-time-in-full (OTIF), order accuracy, pick-and-pack rates, average fulfillment lead time, inventory days of supply, and return processing time. Also review system uptime, shipment cut-off consistency, and cost per order to understand how service levels scale with volume.

Carrier access affects transit times and freight cost: proximity to expressways, rail terminals, and inland ports improves LTL and intermodal options. Evaluate scheduled carrier departures, dock capacity for despatch windows, and last‑mile providers to ensure reliable delivery to customers and distribution partners.

Look for multi-temperature storage, segregated pick zones, returns processing, kitting and light assembly, and strong WMS/OMS integration with APIs. Real-time inventory visibility, batch control, and scalable labor planning are essential to support mixed B2C/B2B order profiles.

Request detailed rate cards and TCO models, define SLA targets and penalties, run a pilot or proof-of-performance, conduct site visits, and audit WMS reports. Validate staffing models for peak volume, ask for references, and include contract terms for capacity growth and exit provisions.