The Optimism Problem: When the Preferred Option Is Chosen Before the Analysis Begins

Optimism bias is one of the more familiar risks in public sector appraisal, but it rarely arrives in obvious form. It tends to enter through the order in which decisions are made. A preferred option is identified early, often informally, and the analysis that follows is shaped, sometimes unconsciously, to support it. Benefits are described generously. Risks are softened. The shortlist of alternatives feels narrower than it should.

The case that emerges from this sequence can look perfectly sound. The numbers add up, the structure is in place, and the narrative reads well. The weakness is harder to see: the appraisal was never genuinely independent of the conclusion. When scrutiny arrives, it tends to surface this asymmetry, and the conversation becomes adversarial rather than analytical.

Stronger decisions come from inverting the order. Structured comparison of options, conducted before the narrative is written, allows trade-offs to be examined honestly. Assumptions can be tested without the pressure of defending a conclusion that has already been reached. The preferred option, when it emerges, carries more weight because it has survived a real comparison.

Business Case Guru supports this discipline by structuring the analytical work first. The narrative is built on top of the appraisal, not the other way around, which keeps the reasoning honest and the eventual case more defensible under review.