Evidence first. Assumptions visible. Limits intact.

Evidence is typed, not blended

A number is useful only when its role is clear. Dromum separates what was observed from what was calculated or assumed.

Observed fact

A dated statement or value captured from an identified source, with locale and context when relevant.

Derived metric

A reproducible calculation based on observed facts and explicit assumptions.

Assumption

A chosen input needed to run a scenario. It is labeled and can be changed or challenged.

Exclusion

A cost, feature or condition deliberately outside the model, stated so the estimate is not mistaken for a complete quote.

Unknown

A material point we could not verify. Unknowns stay visible instead of being filled with invented certainty.

Conflicting sources remain separate

When official surfaces disagree, we preserve the conflict, record which source controls the model and explain why. We do not average incompatible prices or quietly choose the more convenient value.

Calculations should be reproducible

A Dromum model exposes the relevant inputs, time period and calculation logic. Scenarios are estimates—not merchant quotes—and should produce the same result from the same versioned inputs.

Freshness is part of the evidence

Price and product evidence is dated. A tool states when its controlling evidence was captured and asks readers to verify the live offer before purchasing. Material updates require a new evidence or content version rather than an invisible rewrite.

Current independence state

Dromum is not currently using an affiliate link in its public FreshBooks tool. Its outbound link is observational. If a commercial relationship is introduced later, the relevant asset and disclosure will need to be updated explicitly.