Insist on measurable KPIs: order accuracy, on-time shipment rate, inventory accuracy, average pick-and-pack time, dock-to-stock lead time, and return processing time. Define SLA remedies and reporting cadence, require transaction-level visibility, and set periodic performance reviews tied to operational penalties or service credits.

Evaluate WMS capabilities, API/EDI support, native OMS integrations, real-time inventory feeds, and event notifications. Confirm data-mapping, sandbox testing, SLA for change requests, and the provider's approach to version control, security, and uptime. Prioritize providers with documented integration playbooks and onboarding timelines.

Compare storage (including billable tiers), pick/pack labor rates, packing materials, inbound receiving charges, outbound freight accessorials, returns processing, minimums and monthly fees, and chargeback policies. Validate billing cadence, audit rights, and any volume-commitment discounts or seasonal surcharges to model total cost accurately.

Prioritize proximity to major highways, regional freight hubs, and intermodal terminals to reduce transit time and fuel cost. Assess local carrier density for LTL/FTL and parcel, availability of drayage services to nearby ports, and distribution coverage maps showing 1–2 day delivery windows to core customers. Confirm network redundancy and alternate routing options.