time and motion study

Maintenance Management Resources
Six sigma and lean manufacturing, it's all about money:
Business Industrial Network is your best resource when you need fast solutions. After you view this six sigma area dedicated to learning the true cost of equipment downtime with time and motion study, please visit our company.


True Cost of downtime
Spacer Spacer

TDC- People Category

 Add to favorites



This category is a one time entry of a constant, updated annually, exported from your existing computer systems. Your existing method of calculation need only meet the TDC recommendations below.


It is quite common for daily management decisions related to equipment downtime to be made based primarily on labor cost. Of course, production demand is also right up there on the priority list. When deciding a course of action related to downtime, the number of  idle workers and man-hours to repair is thought to be the total labor cost.

With the True Downtime Cost (TDC) methodology, we pre-determine the TDC cost using all the metrics, not just labor and lost production. Even looking at just labor through a TDC perspective can be very enlightening. We will learn that the indirect affected labor cost is always greater than the more apparent direct labor cost.

The key to realizing greater savings by more informed management decisions is to predetermine the "True" labor cost for each profit center category. (As should be done for all TDC metrics) For example all should be aware of the hourly cost per machine, cell, department, area, facility, etc.


  • Directly affected people

  • Most of the time, one or two machine operators.

Sometimes in more apparent bottleneck cases like air compressors, or corrugators, directly affected idle workers will be realized from six to an entire facility.

  • Indirectly affected people
  • Production
  • Maintenance

  • Management

  • Administrative

As mentioned above, with bottlenecks, all downstream employees should be considered in downtime labor cost. (you may consider them direct or indirect, and may be only a percentage of their hourly cost for reduced production scenarios) There should be four primary categories for indirectly affected people by downtime.


Some may state, "that is covered in our overhead calculations" or "that is covered in our labor per product calculation". That is great as long as those previous methods includes the indirect labor listed below. You will then realize the cost savings, where as those general "Overhead" numbers may not point out a particular cost reduction area. 

  • Production

      • Setup personnel
      • Quality
      • Delivery
      • Engineering
      • Other Production related personnel
  • Maintenance

      • Repair personnel
      • Parts person
      • Engineering
      • Other Maintenance Support personnel
  • Management

      • Floor Supervisors
      • Maintenance Manager
      • Production Manager
      • Engineering Manager
      • General Manager
      • Safety Manager
  • Administrative

      • Maintenance Secretary
      • MIS
      • Accounting
      • Legal


While each individual's involvement may only be minutes, they all add up. Also keeping in line with obtaining the "True" cost, the hourly wage should be calculated from an accounting stand point. That is, how much the employee costs the company per hour, not how much they are paid. 

(A maintenance manager who does a lot of the leg work that could have delegated to his subordinates, may spend 30 minutes supporting the repair of a machine. TDC would show this, and amplify the cost savings to resolve. His base pay may calculate out to $20 per hour. But with insurance, retirement plans, and other benefits, he may actually cost the company $30 per hour.

That 30 minutes of one manager can easily equal the cost of one machine operator. As you move up the management chain, and add all indirect labor, the true labor cost could have been over $100 instead of $15 for one employee.

See Also...

A Regional Survey to Determine the Significance of Human Error in



New Document
Please use the Content Navigation Menu below to share in discussions about "People Category" or look up other related content.

Corporate Sponsors

Supporting the True Cost of Downtime with their product and services

PLC Training

PLC training


Automation training 



Spacer Spacer
MAIN:  Home | TDC | Standards | OEE | Glossary | Download | Search | Feedback
TDC:  Equipment | Labor | Downtime | Link to us | Site Content Page | Awards
Other:  Contact Us | About DT
Entire Site Map