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bom-cost-review

Review a bill of materials for cost, risk, and supply exposure — cost rollup, top-10 cost drivers, single-source and EOL risk, MOQ vs forecast mismatch, cost-down candidates, and tariff/logistics sensitivity. Use when asked to review a BOM, find cost-down opportunities, check component sourcing risk, or sanity-check BOM cost against target. Produces a structured BOM review with a cost driver Pareto, risk flags per line, and a prioritised cost-down list.

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BOM Cost Review Skill

A BOM is a list of promises: that each part will be buyable, at that price, at your volume, for the life of the product. This skill reviews a BOM the way a sourcing veteran does — Pareto the cost, flag the single-source and end-of-life traps before they become line-down events, and separate real cost-down candidates from wishful thinking.

What This Skill Produces

  • A cost rollup by commodity class with % of total
  • Top-10 cost drivers (they usually carry 70–80% of BOM cost)
  • Risk flags per line: single-source, lifecycle (EOL/NRND), MOQ mismatch, long lead time
  • A prioritised cost-down candidate list with realistic savings and effort
  • Tariff and logistics sensitivity notes

Required Inputs

Ask for these if not provided; work with a partial BOM if that's all there is, labelling gaps [missing — request from EE/sourcing]:

  • The BOM — part numbers, descriptions, quantities, unit costs (any format; structure it)
  • Annual forecast volume — needed for MOQ math and price-break realism
  • Target BOM cost — what "good" looks like
  • Sourcing detail if available — approved vendors, country of origin, lead times, lifecycle status
  • Product stage — EVT-stage BOMs get design-out suggestions; MP-stage BOMs get negotiation/resourcing ones

Review Framework

1. Rollup. Group into commodity classes (PCBA/semiconductors, passives, display, battery, mechanicals/enclosure, cables & connectors, packaging & accessories). Show cost and % per class, and total vs target with the gap.

2. Pareto. Rank the top-10 lines by extended cost (unit × qty). Everything after these is noise until the big ten are handled.

3. Risk flags — apply per line, worst flag wins:

FlagTriggerWhy it matters
🔴 Single-sourceOne qualified vendor, no drop-in alternateOne factory fire from line-down
🔴 EOL / ObsoleteLifecycle status EOL or last-time-buy announcedForced redesign or LTB cash outlay
🟠 NRNDNot recommended for new designFine now, redesign within product life
🟠 MOQ mismatchMOQ > ~13 weeks of forecast demandCash tied up, scrap risk on ECO
🟠 Long leadLead time > 16 weeksForecast error becomes shortage
🟡 Custom/tooled partCustom silicon, tooled mechanicalSwitching cost locks the vendor in

4. Cost-down candidates. For each: the lever (negotiate at volume break / second-source and dual-run / value-engineer spec — e.g. tighter-than-needed tolerance, over-spec'd connector / design-out entirely), estimated saving per unit, effort, and earliest cut-in (which build or ECO).

5. Tariff & logistics sensitivity. Note country of origin concentration, HTS-code exposure for high-value lines, and what a duty change or freight spike does to landed cost.

Output Format

BOM review: [product / revision]

  1. Summary — total BOM cost vs target, gap, one-line verdict
  2. Cost rollup — table by commodity class (cost, % of total)
  3. Top-10 cost drivers — table: part, qty, unit cost, extended cost, % of BOM, flags
  4. Risk register — every 🔴/🟠 line with flag, evidence, and recommended action + owner
  5. Cost-down candidates — ranked table: lever, est. saving/unit, effort, cut-in point, confidence
  6. Tariff/logistics sensitivity — exposure summary and scenarios
  7. Data gaps — lines missing cost, lifecycle, or sourcing data [missing — request]

Quality Checks

  • Rollup total reconciles with the sum of lines — no silent arithmetic drift
  • Every top-10 line has a lifecycle and sourcing note, even if [missing — request]
  • Each cost-down candidate names the lever, the saving, and the cut-in build/ECO
  • MOQ flags are computed against the stated forecast, not gut feel
  • Single-source flags distinguish "no alternate exists" from "alternate not yet qualified"

Anti-Patterns

  • Do not quote unit prices without a volume — a price without its quantity break is fiction
  • Do not chase pennies on passives while a top-10 line is single-sourced and EOL
  • Do not claim a cost-down saving without naming the lever and who has to act
  • Do not treat distributor stock as supply security for a single-source part
  • Do not ignore custom/tooled parts in risk review — they are the hardest to move
  • Do not fabricate costs for missing lines — label them and carry the uncertainty into the total

Example Trigger Phrases

  • "Review a BOM."
  • "Find cost-down opportunities."
  • "Check component sourcing risk."
  • "Sanity-check BOM cost against target."

レビュー

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