Prioritize SLA performance (order accuracy, ship time), WMS parity and integration, inbound/outbound dock capacity, cold-chain if required, and scalable labor plans. Assess value-added services (kitting, returns processing) and metrics for peak staffing so the provider can meet seasonal demand without service degradation.

Direct access to highways, railheads, and nearby ports reduces line-haul and drayage costs and shortens transit times. More carrier options improve rate negotiation and transit flexibility, enabling zone skipping and consolidation strategies that lower parcel spend and improve delivery windows for end customers.

Model space and handling rates, slotting and replenishment frequency, inbound transportation, pick-and-pack labor, packaging, receiving charges, tech and EDI fees, and return handling. Include service-level penalties, seasonal labor premiums, and expected inventory carrying costs to calculate true cost-to-serve.

Demand a modern WMS with API connectivity, real-time inventory visibility, parcel carrier integrations, and support for batch picking and wave management. Negotiate clear SLAs for order cutoffs, accuracy, and on-time shipments, plus contingency plans for outages and peak surges.

Request historical performance data for peak periods, staffing plans, temp labor partners, and overflow capacity. Review returns workflow, inspection protocols, and refurbishment rates. Conduct site visits, inspect layout for scalability (cross-dock, staging), and run pilot programs or load tests before committing.