Span of Control

How many a node can answer for at once — three to seven, five about right — before the body adds a branch rather than asking one node to stretch.

Anything that carries others beneath it has a ceiling: a person, a Cell holding subcells, a seat holding a fleet. Past the ceiling the carrying does not merely get harder, it silently stops working — messages are missed, states go stale, and the node becomes the place where the body's information dies. The answer is structural: when the number is exceeded, a branch is added. Nobody is asked to try harder (Subsidiarity, The three charts).

It is load-bearing because it is a ceiling placed on design rather than on willpower, and design ceilings are the only kind that hold. What it protects is the scarce human at the centre of things — the person everyone reasonably wants an answer from, who becomes the Bottleneck of the whole precisely because they are willing (A role held forever quietly becomes a throne, Size of role, size of person).

The same shape recurs at every scale: a body of Cells gathering three or more rather than thirty, and reading only what its parts publish rather than everything inside them (Supercell, Nucleus, Selectively Permeable Membrane).

It must be kept apart from a Cell's own size, which looks similar and is not. Three to thirteen souls, best at four to seven, is a covenant number — how many can cohere as one body and know one another by name. Span of control is a carrying number — how many a single node answers for. A Cell of seven answers to one another as equals; there is no supervisor among them (Cell, Levels Of Scale).

The number itself is a proposal borrowed from bodies that coordinate under emergency, and it is held as an estimate rather than a measurement. The field's own caution belongs on the page: it is only as good as the hands that know it, and its most-cited failures were people who did not respect it rather than the design itself. It is settled only after some seasons' running.

Also called: the carrying number Stands on: Holon · Cell · Subsidiarity Opens onto: Supercell · Cell of Cells · Nucleus · General Agent · Cell+ · Bottleneck · Term Limits And Rotation · Levels Of Scale · The three charts In play: Home — read whenever a body is deciding whether to add a branch Sources: Projects/the term pages/Span of Control.md (draft, unreviewed; borrowed from incident-command practice and marked a proposal until it has run some weeks) · Cell (canon-grade — the covenant number it must not be confused with) · lionsberg.wiki: Cell Open: The page's own note: the number is measurable only after the design has run for some time, and nothing has yet run. · Whether an agent-holding seat has the same ceiling as a human one is asserted and untested.