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| Cause and Effect Matrix
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| Introduction |
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The Cause and Effect Matrix is a tool which is used to prioritise potential causes by examining their relationship with the CTQs.CTQ’s are placed on the top of the matrix and causes are place along the left side. The CTQ’s are ranked in terms of importance. The relationship between the causes and CTQs are ranked. An overall score is calculated and the cause with the highest overall score should be addressed first because they will have the largest impact on the CTQs.
A Spreadsheet that numerically relates inputs (X's) to customer outputs
A detailed process map serves as the main input
Inputs can be taken from FMEA (with high RPN), IO sheet, Or fish Bone
The outputs are ranked by the customer's priorties, or project (Y)
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| C & E Example |
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The Mehtod
List the output that are important to the customer (Y's)
Rank the output based on customer priorties
List the inputs (x's)
Rank the contribution of each input (X) to output (Y) - 9 for very high, 3 for moderate, and 1 for low
Multiply the contribution (X) by weight (Y) and add
Identify the critical inputs based on Total value
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Process output(Column),
Process Input (row)
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Grass
Color (deep green preferred)
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Thickness
of Grass
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Weeds
(none preferred)
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Total
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Rating of importance
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10
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8
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8
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Fertilizer Type
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9
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3
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3
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138
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Watering Frequency
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3
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9
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3
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126
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Mower Height
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9
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9
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9
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234
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Fertilizer Frequency
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3
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3
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3
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78
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Watering Duration
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1
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1
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3
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42
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Cutting Frequency
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3
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9
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1
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110
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Operator Experience
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1
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9
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1
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90
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Brand of Mower
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9
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1
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1
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106
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