Put it in front of its users

Make the output fit the meeting, the screen and the person who will use it, then watch them use it.

The model is built, checked, and sitting on a modeller's laptop. The last step is getting its answer into the room where the decision happens, in a form the people there can argue with.

Fit the meeting

Ask how the decision is actually made: a council agenda, a budget sheet, a morning briefing, a public hearing. Produce the output in that form. A beautiful 3D scene that cannot be printed into the agenda pack is not in the meeting.

One picture, and the sentence under it

For each scenario, one map or chart that a person can read in thirty seconds, with the sentence from the check under it: how close the model came to the past. Everything else is a layer down, for the people who want it.

Let them touch it

Where the question is one people argue over, give them the controls: a browser page where they can change the one thing they care about and watch the result. The combining proposals question page lists tools built for this. Keep the controls few.

Watch

Sit with the users the first few times. Note where they hesitate, what they ask, what they ignore. Fix the output before fixing the model; the most common failure is a correct answer nobody could read.

Publish what you can

A model whose outputs, inputs and sources are public can be checked, reused and cited. Bay Layers on this site publishes its source; the digital twins section marks which projects run and which are open.