What would make you trust a public institution more, and what should it publish to earn that trust?

Trust in public institutions rises and falls, and surveys show it varies widely between countries and between kinds of body. But the general question, what actually earns trust, is often answered with slogans.

We are asking for specifics. Think of one institution you deal with, such as a tax office, a hospital, a city council, a court or a police service. What single piece of information, process or behaviour would most increase your trust in it? It might be publishing its mistakes, explaining a decision in plain language, showing how complaints are handled, or allowing independent checks.

A good answer would name the institution type, describe the missing information or behaviour, explain why it would change your view, and say how you would know whether it was being done honestly.

We are especially interested in answers from people who have been through a hard experience with an institution, and what they wish had been different.