Before a first order, a simple supplier evidence file turns conversations into a visible trail you and your team can trust. The file does not need sophisticated software. It needs consistent naming, provenance for each item, and clear notes about who said what and when. Below is a stepwise method to collect documents, compare offers, and record the choice you will make.

Start with a minimal file structure and naming rules

Create a single shared folder for each supplier and a mirrored local backup. Within that supplier folder, make subfolders for Documents, Quotes, Calls, Samples, Visits, and Decision Log. Keeping the same folder labels across suppliers makes later comparisons quick and reduces mistakes when multiple people work on sourcing.

Use a strict file naming convention that includes date (YYYYMMDD), document type, supplier short name, and a short identifier. Consistent names keep files in chronological order and show provenance at a glance. Add a version suffix for revised documents so you never overwrite source material.

• Example filename format: 20260510_Quote_SupplierABC_SKU123_v01.pdf
• Folder set: /SupplierABC/Documents, /SupplierABC/Quotes, /SupplierABC/Calls, /SupplierABC/Samples, /SupplierABC/Visits, /SupplierABC/DecisionLog

Capture original documents and validate provenance

Ask for original PDFs or scanned paperwork rather than photos when possible. For commercial quotes and factory documents, request a cover email that includes the sender, the date, and the explicit quote or term. Save the full email as an .eml or export to PDF so the headers and timestamps are preserved with the file.

When a document is supplied in a language you do not read, save both the original and a plain-language translation created by your team. Record who produced the translation and when. That preserves the source while making content usable for colleagues who will review the offer.

• Save invoices, business licenses, product spec sheets, testing reports, and payment term letters with original headers
• Keep email threads with attachments as primary proof of terms and quotation dates

Log quotes and make a transparent comparison

Record each quote entry in a simple comparison table saved in the supplier folder. Include quote date, validity period, unit price, MOQ, lead time, incoterm or delivery term stated, currency, payment terms, any tooling or sample charges, and who at the supplier provided it. Link the table entries to the saved quote files so reviewers can open the original with one click.

When quotes change, keep the earlier quote file and add a new dated file. In the comparison table, mark which quote is current and why a revision was issued. If a supplier provides conflicting terms in different places, note the difference and raise it as a clarification item in the Decision Log.

• Comparison fields to capture: Date; Price; MOQ; Lead time; Incoterm; Payment terms; Validity; Notes/link to quote file

Summarize calls and track sample exchanges

Every call or video meeting should have a short written summary saved under Calls. Include date, participants, duration, main agreements, open questions, and action items with owners and due dates. Attach meeting chat logs and link to any slides or images discussed. Use the same naming rule so summaries remain chronological.

Track physical samples in the Samples folder with a sample log that records when the sample was shipped, courier and tracking number, who received it, received condition, sample ID, and a brief evaluation. Keep photos of the sample next to the log entry and note any agreed next steps such as a revision request or lab test referral.

• Sample log fields: Sample ID; SKU; Date sent; Courier/Tracking; Received by/date; Condition; Evaluation; Link to photos

Document visits, photos, and verification notes

If you or someone on your team visits a supplier, save a typed visit report with date, who attended, factories or sites visited, and observations tied to evidence. Attach photos with filenames that relate to the report sections. Note any discrepancies between what was shown and documents previously provided; save both for side-by-side comparison.

When verification requires third-party input, save the engagement letter or terms with the verifier and the final report in the Visits folder. Record the verifier name, scope, and date of the check. That shows what was examined and supports any follow-up questions you may send to the supplier.

• Visit report items: Attendees; Locations; Key observations; Photos referenced by filename; Open issues and owner

Use a decision log and set the next action

Maintain a Decision Log as the single source of truth for why you will place or delay a first order. For each decision entry, record the date, decision maker, the summary of evidence relied on, the chosen action, and any conditions attached to that action. Keep it brief but precise so anyone can see why the decision was made without rereading the entire file.

Before placing the first order, run a short checklist from the Decision Log: have you saved the current quote, confirmed sample acceptance, documented agreed lead time, recorded payment and delivery terms, and assigned a follow-up owner for open items? If any item remains unresolved, note the specific risk and the mitigation you require before proceeding.

• Decision Log fields: Date; Decision maker; Evidence links; Action taken; Conditions; Follow-up owner/date

Create the supplier folder now and save one recent quote, a call summary, and a sample entry to start the evidence file.