Use consistent inputs
Hold order volume, units per order, storage, parcel mix, and destinations constant. Include the fees that sit outside picking: receiving, materials, software, returns, and minimums. Keep assumptions visible next to the total.
Stress the quote
Change one input at a time. What happens when orders fall, storage rises, or peak demand adds work? Record which proposal remains acceptable in each scenario. Use the cost worksheet for your estimates, not as a provider’s confirmed rate.
Reconcile one example month
Choose a normal month and list the activities that should appear on an invoice. Include receiving, storage, picking, packing materials, shipping, returns, and project work where applicable. Ask how minimums interact with those charges. Keep the provider’s original fee names beside your own cost categories. This lets you check the arithmetic without losing the conditions attached to a line item.
Define a test before recording a score
Write the expected result, the sample, and the evidence you will accept. Keep a failed requirement separate from an unanswered question. Use the same test across providers where their proposed scopes are comparable. If the test changes, record why; otherwise an improved score may reflect an easier question rather than a better fit.
Use this question in your next meeting:
Can another person trace the proposed total to quantities, rates, and written assumptions?
Go deeper: Build a 3PL scorecard that can survive a second look. The companion article includes an editable worksheet and links to provider profiles.
Further reading
Shopify: fulfilling orders. Background on fulfillment workflows and working with fulfillment services.