Run chart

Editors rating: 
No votes yet
Users rating: 
Your rating: None
No votes yet
Alternative names: 
Run and Control Chart
Intent or purpose: 
The intent of this process is to graphically display shifts, trends, cycles or other patterns over time, which can be used to identify problems and also to monitor progress when solutions are carried out.
Recognizable Components: 
The essential step for this method is the research of data.
Types of Participants: 
Any types of participants can be involved in this process.
Recommended size of group: 
Remarks about group size: 
The group can be of any size.
Optimal amount of time needed: 
The optimal amount of time needed depends on the problem issued and the extent to which it is discussed.
Usual or Expected Outcomes: 
The outcome should be a run chart that helps to detect unwanted changes.
Level of participation: 
The level of participation is low as the participants do not necessarily have to work with the facilitator but can only be examined.
Ideal Conditions: 
There are no special conditions needed.
Potential Pitfalls: 
A potential pitfall is the use of too many notations on the chart, and of course the misinterpretation of data.
How is success evaluated: 
The process is successful when a chart has been created that displays causes of variations of a process.
Type of Facilitator-Client Relationship: 
A special Facilitator-Client Relationship is not neccesary.
Level of Difficulty to Facilitate: 
Not set
Facilitator Personality Fit: 
The facilitator does not need any particular characteristics.
Setting and Materials: 
A computer in order to create the chart is recommended, however the chart can also be hand drawn.
Resources Needed: 
There are no additional resources needed.
Pre-Work Required: 
There is no work that needs to be done beforehand.

In order to create a run chart, the facilitator needs to collect at least 25 data points (number, time, cost) to begin with. It has to be recorded when the measurement was taken, and then needs to be arranged in a chronological order. Next, determine a scale for the vertical axis as 1.5 times the range. The axis has to be labeled with the scale and unit of measurement. The third step is to draw the horizontal axis and then mark the measure of time being any unit (minute, hour, day, shift, week, month, year, etc.). Finally, plot the points and then connect them with a straight line between each point. Draw a center line, being the average of all the data points.
Following are some guidelines for interpreting a run chart: 1. Eight consecutive points above (or below) the center line (mean or median) suggest a shift in the process whereas six successive increasing (or decreasing) points suggest a trend. Fourteen successive points alternating up and down suggest a cyclical process.

How flexible is the process?: 
The process is very flexible in terms of the problem dealt with, and the estimated time.
Follow-Up Required: 
There is no follow-up requiered.
Selected publications: 
see references
1. Chambers, John, William Cleveland, Beat Kleiner, and Paul Tukey, (1983). Graphical Methods for Data Analysis. Wadsworth. 2. NIST/SEMATECH (2003). "Run-Sequence Plot"In: e-Handbook of Statistical Methods 6/01/2003 (Date created). 3. Pyzdek, Thomas (2003). Quality Engineering Handbook (Second Edition ed.). New York: CRC. ISBN 0-8247-4614-7