Quality Tools

The following are the most
widely used Quality control tools



Run Chart :
Run charts are used to analyze processes according to time or order. Run charts are useful in discovering patterns that occur over time.



Detailed tutorial



Pareto Chart :
Pareto charts are extremely useful because they can be used to identify those factors that have the greatest cumulative effect on the system, and thus screen out the less significant factors in an analysis. Ideally, this allows the user to focus attention on a few important factors in a process.




Flow Chart :
Flowcharts are pictorial representations of a process. By breaking the process down into its constituent steps, flowcharts can be useful in identifying where errors are likely to be found in the system.



Detailed tutorial



Cause and Effect Diagram :This
diagram, also called an Ishikawa diagram (or fish bone diagram), is used to associate multiple possible causes with a single effect. Thus, given a particular effect, the diagram is constructed to identify and organize possible causes for it.



Detailed tutorial



Histogram :Histograms
provide a simple, graphical view of accumulated data, including its dispersion
and central tendancy. In addition to the ease with which they can be
constructed, histograms provide the easiest way to evaluate the distribution of
data.



Detailed tutorial



Scatter DiagramScatter diagrams are graphical tools that attempt to depict the influence that one variable has on another. A common diagram of this type usually displays points representing the observed value of one variable corresponding to the value of another variable.



Detailed tutorial



Control Chart :




The control chart is the fundamental tool of statistical process control, as it indicates the range of variability that is built into a system (known as common cause variation). Thus, it helps determine whether or not a process is operating consistently or if a special cause has occurred to change the process mean or variance



Detailed tutorial