From a correct calculation to a useful decision

A calculation can be mathematically correct and still answer the wrong question. Before presenting a result, state the decision it is intended to inform.

Imagine a team comparing two business projects. One analysis ranks them using a single financial measure. The decision-maker also needs to understand the assumptions, the resources required and the implications of choosing one project over the other. The calculation contributes to that discussion, but it does not define every consideration.

A useful explanation separates inputs supplied by evidence, inputs estimated for the exercise and choices made by the analyst. This allows a reviewer to challenge the reasoning without having to reconstruct the entire model.

Instead of presenting only a final figure, explain which assumptions matter most and what further information would improve the assessment. Where an uncertainty cannot be resolved, describe it clearly.

This is part of Houmark's emphasis on applied judgement: understanding why an answer matters, when it can be used and what consequences may follow.

An effective briefing can begin with the question, explain the finding, identify the main trade-offs and state what remains uncertain. Supporting calculations should make the reasoning inspectable.

Try reading the briefing aloud to someone who has not seen the spreadsheet. Can they explain the choice under consideration? Can they identify an assumption that could change the conclusion? If not, the explanation needs more work.

Professional capability develops through this connection between knowledge and use. The aim is to make analysis accurate, understandable and relevant to the situation in which it will be applied.