Straight Answers
Engineering Proposal vs Statement of Work vs MSA: What Each Document Does
A proposal recommends what to do and why, with options and a price for the first piece. A statement of work (SOW) is the binding scope for one piece of work: deliverables, acceptance criteria, milestones, schedule, price and billing terms. A master services agreement (MSA) holds the legal terms that apply to every SOW: confidentiality, IP ownership, liability and payment terms. You usually read the proposal, sign the MSA once, and then sign one SOW per phase.
The proposal: the recommendation
- Restates your problem in plain terms, so you can check it was understood.
- Recommends an approach and a first piece of work, with alternatives where they exist.
- Names who would do the work and what they have done before.
- Lists the assumptions behind the price and the questions still open.
- It is not a contract. Its job is to help you decide.
The statement of work: the binding scope
- Deliverables as artifacts you can check: schematic and layout project, Gerbers, BOM, a tagged firmware release, a test report.
- Acceptance criteria for each deliverable, and how long you have to accept or reject it.
- Milestones, schedule and billing terms, plus what you will supply and when.
- Written non-goals: what this piece of work will not do.
- Hardware lines: parts and fabrication priced separately, review rounds stated as a number, and who pays for a respin.
The MSA: the legal terms for every SOW
- Confidentiality, IP ownership, warranties, limitation of liability, payment terms, termination and dispute resolution.
- Sign it once; each new phase is a new SOW under it, so you don't renegotiate legal terms every time scope changes.
- A limitation of liability, often capped at the fees paid, and a carve-out for prototypes and modifications are normal in hardware engineering agreements.
IP and changes
- Product-specific work transfers to you once it is paid for: schematics, PCB files, Gerbers, BOMs, firmware source, CAD, drawings and test records.
- The engineer keeps their pre-existing tools, libraries and general know-how, and licenses you whatever is built into your deliverables.
- Every change in scope gets a short change order: what changes, the cost and schedule impact, and who approved it. No change order, no change.
Red flags in each document
- A proposal with one large program price, no assumptions and no smaller first step: the unknowns have been priced as if they were known.
- A statement of work whose deliverables are activities ('support firmware development') instead of artifacts you can check at acceptance.
- No acceptance criteria, or acceptance that happens automatically after a few days of silence with nothing to test against.
- IP that transfers only at the end of the whole program, or not at all until a final payment you may never reach.
- No change-order clause, which turns every scope question into a dispute over the invoice.
- An agreement with unlimited liability on either side, which usually means nobody has read it carefully.
The order on Talent Badger
- Brief or upload at talentbadger.com/start, then a discovery call if you want one.
- An NDA first if you need one, then the written proposal with the first fixed piece.
- The agreement and statement of work for that first piece, with billing terms set in the SOW. Nothing is billed until it is signed.
Common questions
Generally no. A proposal is a recommendation and an offer to agree terms. The statement of work and the agreement it sits under are what bind both sides.
