Lesson 24 ª

 

 

 

 

 

   

 

Control Systems

Ishikawa

The observed effects are analysed. We try to identify the causes which originate the problem.

Histograms:

Histograms represent data distribution that allows us to interpret deviations and their possible causes. On the "Y" axis, frequency (F) are reflected. On the "X" axis, we find the subject intervals (A-D) to be measured. These histograms can be the result of control sheets (explained below) to visualize generated data.

Control Sheets:

Data is collected to calculate frequency later on. It is a list of frequency from an attribute or a variable. Based on this list, we can form, for example, histograms. Symptoms in a quantifiable appearance are represented on these sheets. Their advantage is that they are easy to use and no statistical knowledge is needed.

 

Control Sheet

 

Product:

 

Date:

Error

Frequency

Sum

A

IIII IIII IIII II

17

B

IIII

5

C

III

3

D

IIII II

7

Sum

 

32