Featured Product
This Week in Quality Digest Live
Six Sigma Features
Gleb Tsipursky
Use this three-step process to prevent disasters in implementing decisions
Celia Paulsen
Downtime provides an opportunity to refocus before driving forward again
Donald J. Wheeler
While this worldwide, unintended experiment continues we won’t immediately know if we have passed the peak
Ken Maynard
How to create a continuous improvement culture in any organization
Jody Muelaner
A standard set of graphical methods for improving quality

More Features

Six Sigma News
Collect measurements, visual defect information, simple Go/No-Go situations from any online device
Good quality is adding an average of 11 percent to organizations’ revenue growth
Floor symbols and decals create a SMART floor environment, adding visual organization to any environment
A guide for practitioners and managers
Making lean Six Sigma easier and adaptable to current workplaces
Gain visibility into real-time quality data to improve manufacturing process efficiency, quality, and profits
Makes it faster and easier to find and return tools to their proper places
Version 3.1 increases flexibility and ease of use with expanded data formatting features
Provides accurate visual representations of the plan-do-study-act cycle

More News

Jay Arthur—The KnowWare Man

Six Sigma

Visualizing Delay, Waste, and Nonvalue-Added Work

Using a time value map

Published: Wednesday, June 18, 2014 - 17:18

When looking at any existing process, people often have a hard time visualizing the enormous amount of delay, waste, and nonvalue-added work involved. That’s where a time value map comes in; it makes the invisible waste visible. A time value map shows value-added and nonvalue-added activities and delays.

The 3–57 rule

Managers often say: “My people are busy.” But when you follow a work product through a process, you soon discover that people may only be working on it for three minutes out of every hour. The other 57 minutes are preventable delays. A time value map helps illustrate this problem.

Here is an example of a time value map. Any bar above the center line is value-added (VA). Any bar below the center line is nonvalue-added (NVA). The center line represents the timeline for the process, from start to finish. The gaps between bars are assumed to be no-value added delays (i.e., queue or wait times) and can be eliminated with value stream mapping and spaghetti diagramming. From a lean perspective, the goal is to eliminate the NVA and delays to accelerate the process.

Ideally, one would want the time value map to look more like the following with minimal wait time and NVA:

Although time value maps can be drawn by hand, that can take a lot of time. And they are almost impossible to create in Microsoft Excel. However, they are easy to create with the QI Macros Time Value Map Template.

To create a time value map in QI Macros for Excel:

1. Click on “Lean Tools->Time Value Map” to open the template.

Click for larger image.

2. Put the start time in E2.
3. Put the touch time (duration) for each activity, value-added or nonvalue-added, in column B.
4. Put the queue (i.e., wait) time in column C.
5. Put a “1” or “–1” in column D for value-added (1) or nonvalue added (–1).
6. Set the interval for the chart (e.g., 0:01 minutes or 0:05 minutes).
7. Click the Create Time Value Map button.

This will also give a column chart of VA vs. NVA vs. total elapsed time.

The column chart shows that value-added activities account for only about 7 percent of the total elapsed time. Eliminating delays between steps and nonvalue-added processing will dramatically improve performance and customer satisfaction.


About The Author

Jay Arthur—The KnowWare Man’s picture

Jay Arthur—The KnowWare Man

Jay Arthur, speaker, trainer, founder of KnowWare International Inc., and developer of QI Macros for Excel, understands how to pinpoint areas for improvement in processes, people, and technology. He uses data to pinpoint broken processes and helps teams understand their communication styles and restore broken connections. Arthur is the author of Lean Six Sigma for Hospitals (McGraw-Hill, 2011), and Lean Six Sigma Demystified (McGraw-Hill, 2010), and QI Macros SPC Software for Excel. He has 30 years experience developing software. Located in Denver, KnowWare International helps service and manufacturing businesses use lean Six Sigma tools to drive dramatic performance improvements.