The question is not about inviting few or many people, but about who is in the room to finalize the meeting.
For large organizations, invite true authoritative representatives from each party, not the entire group. Mandatory conditions: each representative must be recognized by their group, have the authority to make decisions on behalf of their group, and be responsible for communicating back after the meeting. If a representative does not meet all three conditions, decisions made in the room will fall apart as soon as they leave.
This question arises in most brand projects involving two or more departments. The answer does not depend on the feeling of "who should know this" but on a single criterion: can this meeting reach a conclusion? If there are too many people in the room without anyone being given sufficient authority, the meeting will drag on, opinions will be scattered, and the result will be a vague consensus where everyone goes home and disagrees.
Research on decision-making group structures shows that overly large groups lose the ability to converge. J. Richard Hackman's two-pizza rule sets the group size threshold at what can be fed with two pizzas, roughly five to seven people. Exceeding that threshold means each additional opinion does not add quality but only increases processing time and the number of compromises.
In the context of brand consulting, the practical outcome is: a two-hour meeting that results in no decisions that can be documented as an action plan. Everyone leaves the room feeling like "we had a meeting," but no one is clear on what the next steps are or who is responsible.
Inviting representatives does not mean inviting the highest-ranking person available. According to Beyond Intractability's stakeholder analysis framework, a representative is only valid if they meet three specific conditions.
Missing one of the three, that representative is merely an attendee. Decisions made in the room will not be recognized by the remote team.
Aubrey Mendelow suggests mapping stakeholders on a two-axis grid: power (the ability to influence decisions) and interest (the degree of being affected by outcomes). This grid helps identify who needs to be in the decision room, who should be consulted beforehand, and who should be informed afterward.
When clients have multiple departments or stakeholders, Sinh Vũ suggests a two-layer structure instead of a single session with everyone.
A small decision-making loop. A broad feedback loop to ensure representatives have materials before entering the room and content to take back afterward.
Practical experience of Sinh Vũ
In the preparation phase, Sinh Vũ clarifies with each representative: what they are allowed to finalize, and what needs to be reported back before a final decision is made. Clarifying this before the meeting takes about fifteen minutes. Without this clarification, the meeting could drag on indefinitely without yielding results.
The simple principle is: the chairs in the decision-making room are a limited resource. Use those chairs for people who can make decisions during that meeting, not for those who just need to be informed.
Topic: Invite representatives from all parties or invite all relevant people into the consultation room? Sinh Vũ guide, sinhvu.com
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If you have marked most of the signs above, this is the time to discuss in more detail. Sinh Vũ can help you review and propose a direction.
Stakeholder Representatives, Beyond Intractability; Aubrey Mendelow, Power-Interest Grid (1991), Proceedings of the International Conference on Information Systems; two pizza rule (J. Richard Hackman, TechTarget).
Depending on whether the boss has truly delegated authority to someone. If there is already someone with a clear mandate, the meeting can proceed. If not, postpone and clarify the mandate first, as finalizing without the boss's approval wastes time for both sides.
No. Having twelve people in a decision-making session makes it difficult for discussions to converge and often results in no decisions being made. Keep the decision-making circle to four to six people who have authority, while the other three departments can participate through separate feedback rounds before or after.