Which unknown is worth checking first?
Information is useful when it can change a decision. Before choosing a room for an event, confirming its capacity may matter more than comparing wall colours. A question has high decision value when different answers would lead to different actions and the answer can be obtained at a reasonable cost.
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Investigate the uncertainty that matters
Two rooms are available for a session with forty participants. One room's capacity is unclear. Both have suitable furniture, but their wall colours differ.
Checking capacity could eliminate an option. Studying the paint shades may add detail without changing the choice.
The value of information depends on what the answer enables you to do. Ask what you would choose if the answer were yes, and what you would choose if it were no. If both paths lead to the same action, the question may have little immediate decision value.
Information also has a cost in time, effort or delay. The aim is not complete knowledge. It is enough relevant knowledge to make a better choice than you could make without it.