TAKT time
Lean Management Systems work on a rhythm. The whole organization works on the rhythm provided by the customer. This rhythm is known as the TAKT time of the system. This is the ultimate pull scheduling system anyone can think about.

Takt time can be first determined with the formula:
T = Ta/Td
Where
TT = Takt time,
Ta = Net time available to work,
Td = Time demand (customer demand),

Net available time is the amount of time available for work to be done. This excludes break times and any expected stoppage time (for example scheduled maintenance, team briefings, etc.).
For example, think you work 8 hrs a day for 5 days a week. For a week you have a demand of 100Pcs. Then your calculation will be as follows.

Takt = 8 x 5 x 60 minutes / 100 Pcs
= 24 minutes
What is the meaning of this? This means that the time given by the buyer to produce a finished PC is 24 minutes. This does not mean that you should produce 2Pcs in every 48 minutes. It doesn't mean that the system should produce an item in less than 24 minutes. Both these scenarios can lead to inefficiencies and wastes in the system.

If we aim to produce 20Pcs a day we have no need to produce an item every 24th minute. In this case the system may not run smoothly. For example, it might produce 12Pcs in the first 7 hours and the remaining 8Pcs in the last hour (of course if they have enough capacity). This is not the aim of a lean manufacturing system. So you can understand that not only the work, but also the way the work is carried out is important in lean management.

If we produce a piece of that particular product in 20 minutes what will be the end result? You will either produce quantities greater than required or you might have an idle time. Over production and waiting are wastes in lean manufacturing. Both will lead to higher WIP accumulation and related problems.
Advantages of sticking to the takt time.

• It will give you the rhythm in which the system should operate
• Production is smoothly planned and operations will be carried out without interruptions
• The system is in synchronization with customer requirement
• Pull scheduling is enabled
• No over production
• No rush hours in work
• WIP reduced and problems in the system will be revealed

Takt time principle will work very well in cases where the demand can be traced easily. In a system where there is a fluctuating demand the takt will change continuously on the basis of the demand.