Sales is a function. Finance is a function. Client delivery is a function. The person doing the work can change, but the work still has to exist. That’s the point: a function gives you an objective view of the business. Not “what does Sarah do?” but “what work does the company need to perform?” Roles are messy, because people wear multiple hats, leave, and grow. The work remains.
Think about a hardware store with sections: paint, electrical, plumbing, checkout, inventory. The same employee might cover paint and checkout on a slow day, but those sections are still different. You wouldn’t organize the store by whoever happened to be standing there on Tuesday.
How it shows up
A function chart isn’t an org chart. An org chart shows people and reporting lines. A function chart shows the work, and ownership sits on top of it. In work architecture, a function breaks into a subfunction, then into a core activity, so the top level names the major kind of work and the lower levels name what actually happens. A function also differs from a workflow: a workflow shows the order work moves in, while a function groups similar work together.
Why you care
If the work is invisible, you can’t improve it, and you can’t see duplicate tools, fuzzy handoffs, or missing owners. AI makes the need sharper. An agent can’t responsibly “run marketing” if nobody has named what marketing includes. Name functions cleanly and delegation gets easier: you can decide what a person owns, what an agent assists with, and where a skill belongs.