Operations.

Takt Time

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The question

Ask whoever runs your busiest repeated process how often a finished one has to come off the end for the business to keep the promises it's already made — could they give you a number, or would they tell you they're going as fast as they can? One of those is a rate you can staff to. The other is an apology.

The idea

Takt is German for beat — the word for what a conductor keeps. It reached Japanese industry from German aircraft plants of the 1930s, where airframes were moved between stations at a fixed interval, and Toyota later built its entire rhythm on it. Yasuhiro Monden, a Japanese professor of management accounting, set the practice out for English readers in Toyota Production System (1983), five years before Taiichi Ohno's own account of the system was translated. The arithmetic is trivial: take the working time genuinely available in a period, divide it by the customer demand inside that same period, and you have the interval at which a finished unit has to appear. Four hundred and eighty minutes, sixty orders, one every eight minutes. That single number is the difference between an exhortation and a specification. 'We need to move faster' can't be staffed, scheduled or argued with. 'One every eight minutes' tells you how many people the work needs, which of your steps sit above the beat, and roughly when in the day things will start going wrong — and it tells you all of that before anyone's worked a shift.

The framework

01
Compute the available time honestly, then divide.
The division is easy and the numerator is where people cheat. Available time isn't the hours your team is contractually present: subtract breaks, the stand-up, handover, planned maintenance, and the twenty minutes at the end of a shift that nobody schedules and everybody uses. A takt built on paper hours produces a beat nobody can hold, and the first week of missing it teaches your team that the number is decorative. Demand is the customer demand inside that same window — real orders where you have them, a rolling average where you don't. Recompute it when demand moves; monthly is usually right, daily is just noise.
02
Takt, cycle time and lead time are three different numbers.
Takt is set by the customer and by nothing else; it's the rate demand requires of you. Cycle time is what a step actually takes when you stand next to it with a watch. Lead time is the whole elapsed journey from order to delivery. The useful move is laying every step's cycle time against takt on a single line: anything sitting above the beat is where work will accumulate, and it will accumulate whether or not the person running it is working hard. Teams routinely confuse the three, which is how you end up celebrating a fast step standing in front of a slow one.
03
How many people does this work actually need?
Total work content divided by takt gives you the number of people or stations the work requires: forty minutes of hands-on work against an eight-minute takt needs five. That single division moves headcount out of the realm of argument, where it's settled by whoever is loudest about being busy, and into arithmetic anyone in the room can check. It cuts both ways, which is exactly why it's worth doing — sometimes it shows you're two people short of the rate you've already promised, and sometimes it shows you're carrying a station the beat doesn't need.
04
There are only three answers to finishing ahead of the beat.
Takt is a rate to hold, not a record to break, so decide in advance what a station does when it finishes ahead of it — the three answers do different things to the beat downstream. Stop, and the beat stays where you set it, with the spare minutes visible rather than absorbed. Help the step sitting above takt, and you lift the one rate that actually sets your output. Pull the next job forward and you've borrowed from your own step rather than the next one, which holds while whoever feeds you keeps pace. Choose none of the three and the choice defaults to the clock, or to whoever has the emptiest bench: the station builds ahead. That's overproduction, the waste at the head of Ohno's list because it manufactures the others.

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