EBK PRINCIPLES OF OPERATIONS MANAGEMENT
EBK PRINCIPLES OF OPERATIONS MANAGEMENT
11th Edition
ISBN: 9780135175644
Author: Munson
Publisher: VST
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Chapter 2, Problem 12P
Summary Introduction

To determine: The range of values for ‘w’ such that Company C is a recommended outsourcing provider using factor rating method.

Introduction:

Factor-rating method:

The factor-rating method is a quantitative approach to make a decision from various alternatives such that the decision is beneficial to the firm involved. This method is utilized to decide on new layout, new locations, best supplier, outsourcing providers etc.

Expert Solution & Answer
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Answer to Problem 12P

Company C is recommended for all values of w such that 1 ≤ w ≤ 25.

Explanation of Solution

Given information:

Ratings of Outsource providers
Factor Weight A B C D
Labor W 5 4 3 5
Quality Procedures 30 2 3 5 1
Logistics System 5 3 4 3 5
Price 25 5 3 4 4
Trustworthiness 5 3 2 3 5
Technology in place 15 2 5 4 4
Management team 15 5 4 2 1

Weights or an scale = 1 - 30

Formula to calculate weighted rating:

Weighted Rating = Importance Weight × rating

Formula to calculate Total weighted rating:

Total weighted rating = Individualweighted rating

Calculation for A:

Calculation of weighted rating:

The weighted rating is calculated by multiplying the importance weighted with individual rating.

Labor:

Labor = w × 5= 5w

The weighted rating for Labor is 5w.

Quality procedures:

Quality procedures = 30 × 2= 60

The weighted rating for Quality procedures is 60.

Logistics System:

Logistiscs System = 5 × 3= 15

The weighted rating for Logistics System is 15.

Price:

Price = 25 × 5= 125

The weighted rating for Price is 125.

Trustworthiness:

Trustworthiness = 5 × 3= 15

The weighted rating for Trustworthiness is 15.

Technology in place:

Technology in place = 15 × 2= 30

The weighted rating for Technology in place is 30.

Management Team:

Management team = 15 × 5= 75

The weighted rating for Management Team is 75.

Calculation of total weighted rating:

The total weighted rating is calculated by the summation of the individual weighted ratings.

Total weighted rating = 5w + 60 + 15 + 125 + 15 + 30 + 75= 5w + 320

The total weighted rating for A is 5w + 320.

Calculation for B:

Calculation of weighted rating:

The weighted rating is calculated by multiplying the importance weighted with individual rating.

Labor:

Labor = w × 4= 4w

The weighted rating for Labor is 4w.

Quality procedures:

Quality procedures = 30 × 3= 90

The weighted rating for Quality procedures is 90.

Logistics System:

Logistiscs System = 5 × 4= 20

The weighted rating for Logistics System is 20.

Price:

Price = 25 × 3= 75

The weighted rating for Price is 75.

Trustworthiness:

Trustworthiness = 5 × 2= 10

The weighted rating for Trustworthiness is 10.

Technology in place:

Technology in place = 15 × 5= 75

The weighted rating for Technology in place is 75.

Management Team:

Management team = 15 × 4= 60

The weighted rating for Management Team is 60.

Calculation of total weighted rating:

The total weighted rating is calculated by the summation of the individual weighted ratings.

Total weighted rating = 4w + 90 + 20 + 75 + 10 + 75 + 60= 4w + 330

The total weighted rating for B is 4w + 330.

Calculation for C:

Calculation of weighted rating:

The weighted rating is calculated by multiplying the importance weighted with individual rating.

Labor:

Labor = w × 3= 3w

The weighted rating for Labor is 3w.

Quality procedures:

Quality procedures = 30 × 5= 150

The weighted rating for Quality procedures is 150.

Logistics System:

Logistiscs System = 5 × 3= 15

The weighted rating for Logistics System is 15.

Price:

Price = 25 × 4= 100

The weighted rating for Price is 100.

Trustworthiness:

Trustworthiness = 5 × 3= 15

The weighted rating for Trustworthiness is 15.

Technology in place:

Technology in place = 15 × 4= 60

The weighted rating for Technology in place is 60.

Management Team:

Management team = 15 × 2= 30

The weighted rating for Management Team is 30.

Calculation of total weighted rating:

The total weighted rating is calculated by the summation of the individual weighted ratings.

Total weighted rating = 3w + 150 + 15 + 100 + 15 + 60 + 30= 3w + 370

The total weighted rating for C is 3w + 370.

Calculation for D:

Calculation of weighted rating:

The weighted rating is calculated by multiplying the importance weighted with individual rating.

Labor:

Labor = w × 5= 5w

The weighted rating for Labor is 5w.

Quality procedures:

Quality procedures = 30 × 1= 30

The weighted rating for Quality procedures is 30.

Logistics System:

Logistiscs System = 5 × 5= 25

The weighted rating for Logistics System is 25.

Price:

Price = 25 × 4= 100

The weighted rating for Price is 100.

Trustworthiness:

Trustworthiness = 5 × 5= 25

The weighted rating for Trustworthiness is 25.

Technology in place:

Technology in place = 15 × 4= 60

The weighted rating for Technology in place is 60.

Management Team:

Management team = 15 × 1= 15

The weighted rating for Management Team is 15.

Calculation of total weighted rating:

The total weighted rating is calculated by the summation of the individual weighted ratings.

Total weighted rating = 5w + 30 + 25 + 100 + 25 + 60 + 15= 5w + 255

The total weighted rating for D is 5w + 255.

Calculation of range of values for w:

The range of values is calculated by equating the total weighted rating of C with all the other outsourcing providers.

Equating C with A:

3w + 370  5w + 320370 - 320  5w - 3w50  2w25  w (1)

Equating C with B:

3w + 370  4w + 330370 - 330  4w - 3w40  w (2)

Equating C with D:

3w + 370  5w + 255370 - 255  5w - 3w115  2w57.5  w (3)

The weights are scaled from 1 – 30 as given in the question. The value of w can only be in the range of 1 to 30. From (1), (2), and (3) the range of ‘w’ so that C is the best outsourcing provider is w ≤ 25. It means that ‘w’ can be assigned a value starting from 1 to 25.

Company C is recommended for all values of ‘w’ such that 1 ≤ w ≤ 25.

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