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Separate three kinds of statements
| Statement type | Example | What to record |
|---|---|---|
| Observed input | A figure from a named public report | Source, period and definition |
| Assumption | A chosen discount rate for the exercise | Reason and sensitivity |
| Calculation | NPV from the stated cash flows | Reproducible formula and inputs |
| Interpretation | Why the two plans differ | Link to the calculation and limitations |
Make the strength of the conclusion fit the evidence
A calculated sensitivity shows what the chosen model does when an input changes. It does not demonstrate that the input will change in the real world. Keep the conclusion attached to the evidence that supports it.
Check the note from another reader’s perspective
Can a reader find the source period, units, assumptions and calculation without asking you? If not, revise those parts. The aim is an inspectable learning project rather than a longer document.
Use shareable material
Use original synthetic examples or public sources you can cite. Remove confidential employer or client material from a public work sample. Identify the work as a personal project and preserve any necessary source-use conditions.