A vague project description (“an app like Uber but for X”) produces wildly inconsistent quotes, because every agency fills the ambiguity with different assumptions. This one-page brief structure removes most of that variance — not because it’s exhaustive, but because it forces the specific decisions that actually drive cost before anyone starts quoting.

Section 1: The one-sentence problem statement

Not the solution — the problem. “Small restaurant owners lose track of ingredient inventory and over-order” is a problem statement. “An inventory management app for restaurants” is a solution jumping ahead of it. Starting with the problem, even briefly, helps a development team catch cases where the proposed solution doesn’t actually fit the stated problem — a genuinely valuable sanity check that a solution-only brief skips entirely.

Section 2: The core user flow, written as explicit steps

Not a feature list — a specific sequence: “User opens app, sees list of ingredients below reorder threshold, taps to generate a supplier order, confirms quantity, order is sent.” This level of specificity is what actually drives accurate quotes, because “inventory tracking” could mean an enormous range of actual complexity depending on the details this section forces you to decide upfront.

Section 3: What’s explicitly NOT included in v1

Often the most valuable section and the most commonly skipped. Explicitly listing deferred features (multi-location support, advanced analytics, integrations with specific POS systems) prevents scope creep disguised as “obviously needed” additions during the build, and prevents different agencies from assuming different things are included by default.

Section 4: Platform and technical constraints

Web, iOS, Android, or some combination — and any hard technical requirements (must integrate with a specific existing system, must handle a certain user volume from day one). This section alone often accounts for the largest cost swings between quotes when left unspecified, since platform choice affects cost more than almost any other single decision.

Section 5: Realistic budget range, stated honestly

Counterintuitive advice: state your actual budget range, don’t hide it hoping for a lower quote. A stated realistic range lets a good agency tell you immediately whether your scope matches your budget (and adjust scope accordingly) rather than quoting to your hidden number and discovering the mismatch mid-project, which is a worse outcome for everyone.

Section 6: Timeline constraints, if real

Only include this if there’s a genuine external deadline (an event, a funding milestone, a seasonal window) — not an arbitrary “as fast as possible,” which every founder wants but which doesn’t actually constrain anything useful for an agency to plan against.

Why one page, not a comprehensive spec document

A comprehensive spec is valuable eventually, but requiring it before getting any quotes creates a chicken-and-egg problem — you need agency input to write a good comprehensive spec, but you need the spec to get accurate agency input. The one-page brief is deliberately the minimum information that produces genuinely comparable quotes, not the maximum information a project eventually needs.

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