Three Disclosure Rules for Conversations Sunshine, Chatham House, and Vegas

Conversations always carry assumptions about what can be shared and how. When those assumptions differ, trust breaks down and good thinking disappears. Naming a simple rule at the start can change how safe, open, and useful a conversation becomes.

Every conversation operates under an implicit agreement about what can be shared and how. The problem is that we rarely make that agreement explicit.

Imagine three colleagues having coffee to talk through a workplace issue. One assumes they are brainstorming ideas she can take back to the team. Another thinks they are venting in confidence. The third plans to quote them both in an email to management. Same conversation, three very different assumptions about what happens next.

This is not unusual. We are constantly operating within an invisible architecture that shapes how conversations work, yet we almost never talk about it.

Three simple sharing rules

Here is a simple way of thinking about conversational openness. There are three basic rules that most conversations fall under, whether we name them or not.

The Sunshine Rule
Everything is open. What is said can be shared freely and attributed by name. You can quote me, pass it on, or make it public. This is on-the-record territory, like speaking in a public forum.

The Chatham House Rule
Ideas and information can be shared, but not attributed to individuals. This middle ground allows people to speak candidly without exposing themselves personally. It is especially useful when insight matters more than authorship.

The Vegas Rule
Total confidentiality. What is said stays in the room. Not just who said it, but the content itself. This is the space for trust, vulnerability, and conversations that would collapse without strong privacy.

You could also describe these simply as open, non-attributed, and closed.

The default problem

In most conversations, we never agree on which rule applies. We rely on context instead.

A formal meeting often feels like Sunshine. A coffee with a friend feels like Vegas. A conference hallway conversation sits somewhere in between. Most of the time, these instincts work well enough.

But not always.

Professional settings often drift into a vague Chatham House mode, where ideas can be mentioned but attribution is fuzzy. Social settings often lean toward Vegas, where privacy is assumed. The trouble starts when two people enter the same conversation with different assumptions.

Think about:
– A manager who assumed a one-to-one was Vegas, while the employee assumed Sunshine and shared the conversation with the team
– A personal story told at a dinner party that quietly becomes neighbourhood gossip
– A brainstorming session where ideas never surface because people assume Chatham House, while the leader expects Sunshine and visible credit

When assumptions collide

The costs are real. Trust erodes. Relationships suffer. People stop thinking out loud. Useful ideas stay locked away because no one is sure what is safe to share.

Careers can be damaged when a tentative, exploratory comment made under Vegas assumptions is later treated as a firm, public position. Organizations can stagnate when everyone defaults to silence, and no safe-sharing rule is established.

The frustrating part is that the fix is simple. We can name the rule.

The mixed-rule reality

It gets more complicated because many conversations shift between rules without anyone noticing.

A team meeting might begin with project updates that are clearly Sunshine. Then someone offers a candid view of a struggling colleague that really belongs in Vegas. Then, a half-formed strategic idea is floated that feels more like Chatham House. All in the same conversation, with no signals that the rules have changed.

The same happens in personal conversations. Weekend plans are Sunshine. Salary numbers might be Chatham House. Relationship difficulties are Vegas. The shifts feel natural, but the boundaries are implicit.

This is where misunderstandings multiply. You think your idea was confidential. Your colleague assumes it was shareable. You believe a personal detail was off-limits. Someone else thinks it was fair game without attribution.

Faced with this ambiguity, people either overshare, treating everything as Sunshine, or undershare, treating everything as Vegas. Both have consequences.

Taking conversations seriously

If we care about conversations, and we should, because they are how we think together, build trust, and make sense of complexity, then it is worth paying attention to these invisible agreements.

This does not mean formal declarations before every chat. Context usually works fine for casual exchanges. But when a conversation matters, when sensitivity, trust, or consequence is involved, a few seconds of clarity can prevent a lot of damage.

“Can we talk about this under Chatham House rules?”
“I need this to be a Vegas conversation.”
“I am fine with this being Sunshine. You can quote me.”

And when the rule changes mid-conversation, it helps to say so.

“What I am about to say is Vegas.”
“This next part you can share, but not attribute to me.”

Why this matters now

We live in a world of screenshots, recordings, forwarded messages, and accidental publicity. What once felt private can become public very quickly. The default level of openness has shifted toward Sunshine, often without us realising it.

That makes naming conversational rules more important, not less. Context alone is no longer reliable.

The value of these three rules lies not in their being new. We already use them instinctively. The value lies in the language they give us. And with language comes choice.

A proposal

Simply notice which rule we are assuming in conversations that matter. And when it is important, take a moment to make it explicit.

Not every conversation needs this. Small talk can remain informal.

But difficult conversations, creative work, personal disclosures, and negotiations all benefit from clarity.

The Sunshine Rule.
The Chatham House Rule.
The Vegas Rule.

Three simple distinctions. Fewer misunderstandings.

We can start taking this seriously in small ways. When a conversation matters, we should pause and name the rule we are assuming. And we should check when it shifts. This small act protects trust, invites clearer thinking, and makes it easier to speak honestly when it counts.