Factor Rating and the Center of Gravity Method
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Transcript of Factor Rating and the Center of Gravity Method
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– Is a general approach that is useful to evaluate a given alternative and given alternatives
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1. Determine which factor is relevant2. Assign weight to each factor that indicates
relative importance compared with all other factors
3. Decide a common scale of all factors and set a minimum acceptable score if necessary
4. Score each location alternatives5. Multiply the factor weight by the score for
each factor, and sum the result for each location alternative
6. Choose the alternative which has the highest composite score, unless it fails to meet the minimum acceptable score
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A photo-process company intends to open new branches store. The following table contains information on two potential location. Which is better alternative
Factor weightalternative Weighted scores
1 2 Alterative 1 Alternative 2
Proximity to existing stores
.10 100 60.10(100)
=10.10(60) =6
Traffic volume .05 80 80 .05(80) =4 .05(80) =4
Rental cost .40 70 90 .40(70) =28 .40(90) =36
Size .10 86 92 .10(86) =8.6 .10(92) =9.2
layout .20 40 70 .20(40) =8 .20(70) =14
Operating cost
.15 80 90 .15(80) =12.15(90) =13.5
1.00 70.6 82.7
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– Is a method to determine the location of a facility that will minimize the shipping cost or travel time to various destination
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If the to be ship to every locations is equal you can obtain the coordinates of the center of gravity by finding the average of x coordinates these average can be easily determine using the following formulas:
Wherexi = x coordinate of destination i
yi = y coordinate of destination i
n = number of destinetion
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Where:Qi= quantity to be ship on the destination
xi = x coordinate of destination
yi = y coordinate of destination
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The coordinate of the destination can be obtain from 8.1B:
Destination
X Y
D1 2 2
D2 3 5
D3 5 4
D4 8 5
total 18 16
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Destination x y Weekly Quantity
D1 2 2 800
D2 3 5 900
D3 5 4 200
D4 8 5 100
total 18 16 2000
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Determine the center of gravity