Tools

Add-Study-Guides.jpg

Read the whole story in our process excellence books

Learn More with our Online Courses

Use Software for your Six Sigma & SPC charts

Get Certified by author Six Sigma Handbook

5S

7MP Management and Planning Tools

8QC Traditional Quality Control Tools

Activity Network Diagrams

Affinity Diagrams

Autocorrelation Charts

Benchmarking

Box Whisker Charts

Bulls-eye Charts

Cause And Effect Diagrams

Check Sheets

Designed Experiments

Failure Mode, Effects, and Criticality Analysis

Flowcharts

Histogram

Interrelationship Digraphs

KAIZEN

Level Load Balancing

Maintainability and Availability

Matrix Diagrams

Measurement Systems Analysis

Normal Probability Plot

Pareto Charts

PDCA Plan-Do-Check-Act

Poka yoke

Prioritization Matrix

Process Decision Program Charts

Regression Analysis

Run Charts

Scatter Diagrams

Statistical Inference

Statistical Process Control (SPC)

Tree Diagrams

Index

When to Use Histograms

SPC Software displays Histogram

Histograms provides a graphical view of the "shape" of the process, which will be very misleading if the process is not stable. The parameters of the distribution (notably location, spread, and shape) are, by definition, changing in an out of control process. Therefore, only use Histograms in conjunction with statistical control charts. (See Interpreting Histograms for further detail).

See also:

Create and analyze a Histogram in Excel


Learn more about the Quality Improvement principles and tools for process excellence in Six Sigma Demystified (2011, McGraw-Hill) by Paul Keller, or his online Green Belt certification course ($499).