flow charting symbols check sheets check sheets explore what and where an event of interest is...
Post on 19-Dec-2015
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Flow charting symbols
Start
Process
Decision
End
Yes
No Wait
Process
CHECK SHEETSCheck sheets explore what and where
an event of interest is occurring.Attribute Check Sheet
Order Types 7am-9am 9am-11am 11am-1pm 1pm-3pm 3pm-5-pm
Emergency
Nonemergency
Rework
Safety Stock
Prototype Order
Other
27 15 19 20 28
PARETO ANALYSISA method for identifying and separating
the vital few from the trivial many.
%
Factor
AB
CD
E F G IH J
CAUSE & EFFECT DIAGRAMS
Pins notAssigned
DefectivePins
ReceivedDefective
Damagedin storage
Maintenance
Equipment Employees
Proceduresand Methods
TrainingSpeed
Condition
ClassificationError
Inspection CPU Chip
BADCPU
HISTOGRAMSA statistical tool used to show the extent and typeof variance within the system.
No. of Occurrences
Outcome
SCATTERPLOTS
Variable A
Variable B
x x x x x x xx x x x x xx x x x x x xx x xx x x x x xx x x x x x xx x x x xx xxx x x x x xx xx x x x x xx x x x xxx xx x x x x xxx x x xx x x xx xx x x x x x xx x x xxx xx xx xxx x x xx xxx x x x x x x xx x x x x x x xx x x xx x x xx x x x
Clearly largervalues of variable Aseemingly are associated with largervalues of variable B.
CONTROL
CHARTS• The purpose of control charts is to tell the operator when
the process is producing output in accordance with the assumed process variation.
• The null hypothesis is that a process is making parts with a given mean and standard deviation.
• If the null hypothesis is true, then a small sample of the expected value of the system’s output will have a sample mean equal to the process mean and a sample variance equal to the sums of the sample size time the process variance.
Control Chart
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
UCL
LCL
Sample number
Mean
Out ofcontrol
Normal variationdue to chance
Abnormal variationdue to assignable sources
Abnormal variationdue to assignable sources
Types of control charts