From the Ask Tom mailbag –

Question:
I read with interest your response on the number of levels in an organization. It sounds good, but as the organization grows, we need more and more managers. It is difficult for a single manager to handle more than 6-7 people on the team. With more managers, don’t we end up needing more layers.

Response:
I would first challenge your assumption on the maximum number of team members for whom a manager is accountable. Your number of 6-7 has no basis in theory or fact. Elliott was often asked this question, let me whisper his number, 70. It is likely that a single manager will begin to struggle when the number of team members reaches 70.

I know the blood just drained out of your face, so as your brain is restoring its circulation, let me explain. The maximum number of team members a manager can effectively be accountable for depends, not on an arbitrary number like 6 or 7, but, rather on the variability in the work.

Large call centers may easily have 70 people on the floor at any one time, with a single supervisor. How can a single supervisor be accountable for the output of 70 people? Look at what those people do. Most of the time, those call center team members do the same work day after day, there is little variability.

How many people on a Navy Seal Team? I would guess six. Why such a small team? The variability of the work is high. The number of people a single manager can be accountable for depends on the work.

Without a frame of reference, organizations do get bloated. I once worked with a company with 12 layers, but only needed 5. Levels of work creates the frame within which we can determine not only who should be whose manager, but how many managers are at the same level. The objective measurement of timespan takes out the guesswork and bias that inevitably creeps in. About once a year, you should round up your managers for a calibration meeting to make sure the bloat is not settling in.