A reasoned decision can change when its evidence or constraints change.
A decision should be reviewed when relevant information, constraints or consequences differ from what was expected. State the original objective and the reason for the original choice, then explain how the new evidence changes the comparison. Reconsider the feasible alternatives and their opportunity costs; do not reverse a decision merely because one figure changed. A useful conclusion is conditional in a specific way: identify what evidence or threshold would make another option preferable. Review can mean continuing, modifying or stopping, rather than automatically abandoning the original plan.
- Why review?
- New evidence can change the expected benefits, costs or available options. A choice that was reasonable earlier may no longer be the best use of resources.
- What can change?
- Review can lead to continuing, modifying or stopping a service. A disappointing figure is a reason to reconsider the comparison, not automatic proof that cancellation is best.
- A conditional judgement
- A recommendation tied to a specific condition explains when it would change. For example, home visits may be preferable if they reach more otherwise-excluded residents within the same volunteer-hours.
A short structure for a supported judgement
Objective and feasible options
Name what the decision maker is trying to improve and which alternatives are actually available.
Evidence and trade-off
Apply relevant facts to the benefits, costs and opportunity cost. Explain how different groups are affected.
Decision and review condition
Recommend an option or a justified next information-gathering step. State which uncertainty matters enough to change that recommendation. Do not promise an outcome the evidence cannot establish.
Worked example: Reviewing a weekend shuttle
A community group chooses a weekend shuttle over a home-visit programme because it expects many residents with limited mobility to reach essential services. The two projects compete for the same volunteers. After a trial, most riders report that they would otherwise have used an existing bus. Several housebound residents remain unable to use the shuttle.
- The objective was improved access for residents with limited mobility, not simply maximising recorded rides.
- The trial raises doubt about the additional access gained: many rides replace existing journeys, while some intended beneficiaries still cannot travel.
- Compare continuing the shuttle, changing its route or eligibility, and redirecting volunteers to home visits. Collect evidence on residents newly served and the resources each option requires.
- A justified recommendation may favour a revised trial or home visits if they achieve more additional access with the available volunteers. If the shuttle uniquely serves another substantial group, that evidence could support retaining it. The data given do not settle every alternative's benefit.
Watch out for this
Changing a decision proves the original decision was irrational.
The original choice may have been reasonable with the information then available. New evidence can change expected benefits, feasible alternatives and the best use of resources.
Check your understanding
After choosing a service, demand is lower than forecast. What should the decision maker do?
- Continue unchanged because the original choice must always be defended.
- Cancel immediately, without considering why demand fell or the alternatives.
- Reassess the objective, new evidence and feasible alternatives before deciding.