Build, Buy,
Partner — or Bridge
A decision instrument for sourcing a capability. Work the framework — is it strategic or commodity, does an external option fit, what does each path cost over four quarters — and reach a defensible decision: build, buy, partner, or bridge.
Capability Sourcing · Vendor Discipline · Decision Audit
Open the toolA decision, not a
gut call.
Build-versus-buy is usually settled by whoever argues loudest, or by a vendor demo, or by the team that wants to build it. None of those is a decision discipline. The cost of getting it wrong — a strategic capability outsourced, a commodity rebuilt from scratch, a vendor lock-in with no exit — compounds for years.
Build vs Buy vs Partner is the discipline for reaching the decision in the right order. Is the capability strategic (shapes how the business competes) or commodity? Does an external option meet the need — fully, partially, or not at all? What does each path actually cost over four quarters? And when a strategic capability has only a partial external fit, is a bridge — buy now, build in parallel — warranted?
Strategic capabilities you cannot shape are liabilities. Commodity capabilities you rebuild are waste.
Run the tool every time a capability is up for a sourcing decision. Build a portfolio — one decision per capability — and the record becomes an audit trail of how the build/buy/partner discipline is actually being applied.
Four questions,
in order.
Strategic or commodity?
Does this capability shape how the business competes, or is it necessary table stakes? Commodity capabilities lean toward buy; strategic ones you want to control.
Does an external option fit?
Yes, partially, no — or not yet assessed. Capture the requirements and, where the fit is partial, the gap that a vendor leaves behind.
What does each path cost?
Compare build, buy, partner, and bridge over four quarters — engineering, licensing, integration, switching, dependency risk. The figures are yours to capture; the conclusion is your read of where they diverge.
Is a bridge warranted?
When a strategic capability has only a partial external fit, a bridge — buy now, build in parallel — can be sound. It holds only when the vendor is bounded, the build is real and resourced, the migration is planned, and the need is genuine.
The framework resolves to
one of four.
Build
A strategic capability with no fit worth buying. You own how it evolves.
Buy
A commodity capability an external option covers. Don’t rebuild table stakes.
Partner
A capability best sourced through a partnership — selected deliberately, not by default.
Bridge
Buy now, build in parallel — only when all four bridge conditions hold and the migration is planned.
Build, buy, and bridge are derived from your answers. Partner is a deliberate override — chosen on the decision screen when a partnership is the right structure.
A decision record,
kept for audit.
Each run produces a recorded decision — the capability and its context, your answers across the framework, the four-quarter cost comparison, the bridge conditions where they apply, and the final decision with its rationale, risks, owner, and a review date six months out.
Decisions are versioned: revisit one as the situation changes and the prior versions are preserved. Many decisions accumulate into a portfolio — one per capability — so the record answers “what did we decide, and why?” months later, when the vendor contract is up for renewal or the build is questioned.
Reach for it whenever a capability is up for a sourcing decision — a new system to stand up, a vendor renewal to weigh, a team proposing to build something an external option already covers, or a partnership on the table.
It is most valuable before the decision feels obvious. The framework’s job is to catch the strategic capability about to be outsourced for convenience, and the commodity about to be rebuilt for pride.
Sourcing decisions are
made in order, and recorded.
Strategic value, external fit, cost, and the bridge test — asked in sequence, answered, and kept. Each decision becomes part of the portfolio. The portfolio becomes the audit trail.
Open the tool