Operations and Supply Chain Management, 9th Edition WileyPLUS Registration Card + Loose-leaf Print Companion
9th Edition
ISBN: 9781119371618
Author: Roberta S. Russell
Publisher: Wiley (WileyPLUS Products)
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Chapter 2, Problem 9.1ASC
Summary Introduction
Case summary:
TG from country S is the third largest telecom company. Its service offering includes landline, cell phone, broadband and TV services. TG has 256 million customers worldwide, the majority of which are cell phone users.
T’s mobile communication subsidiary M has 16 million customers and 4000 employees. M implement Six Sigma and Lean philosophy in 2002, and up till 2011 it has completed more than 200 projects focusing on cost reduction, service level increases, process reengineering, quality assurance and productivity improvement. This resulted in cumulative savings of $245 million. Projects are now executed with focus on three key initiatives – improvement community, workshops, and inheritance stage.
Via this process, M has trained several Champions, Black Belts and Green Belts. The improvement community consists of Black and Green Belts that conduct training on quality issues and mentor other Black and Green Belts in the usage of quality tools. The improvement community also organizes workshops for new project development.
After a team completes the DMAIC stage, the quality team evaluates team performance, followed by an inheritance period of one year. A project heir is assigned – the best performing Green Belt from the team. The heir is responsible for “improve” and “control” sections of DMAIC.
To determine: Another global company that has successfully implemented Six Sigma and discuss its experiences.
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1) Under “Costs of Quality”, costs associated with quality can be classified into four categories: appraisal, prevention, internal failures, and external failures. The costs of quality for Corley Motors Logistics is given in the table.
Cost Elements
Amount
Checking outbound boxes for errors
$31,000
Quality planning
$10,625
Downtime due to conveyor/computer problems
$342,125
Incoming product inspection
$21,000
Customer complaint rework
$33,000
Correcting erroneous orders before shipping
$36,550
Quality training of associates
$25,925
Correction of typographical errors--pick tickets
$11,475
a) Classify the quality cost elements given in the table into the different quality cost categories (prevention, appraisal, internal failure, external failure).
b) Total the quality costs in each of the different quality cost categories (prevention, appraisal, internal failure, external failure).
c) Using a) and b), suggest which areas…
Note: In chapter 9, section 9.4 of the Stevenson text, the costs of quality are covered; chapter 9 Stevenson lecture power point slide 7 touches upon this topic; see lecture video, 3.55 mins to 4.54 mins.
2) The production process at Hansa Ceylon Coffee fills boxes with dark arabica coffee. The data for the fill weight (in ounces) of eight samples are presented below. A sample size of six was used. The firm’s operations analyst wants to construct X-bar and R-charts to monitor the filling process.
Sample
Sample Mean
Sample Range
1
15.80
0.42
2
16.10
0.38
3
16.02
0.08
4
15.95
0.15
5
16.12
0.42
6
16.18
0.23
7
15.87
0.36
8
16.20
0.40
a) Calculate the upper and lower control limits for the X-bar chart.
b) Calculate the upper and lower control limits for the R chart.
c) Is the process under control? Why or why not?
Note: In chapter 10, section 10.3 of the Stevenson text, control charts for variables are…
Chapter 2 Solutions
Operations and Supply Chain Management, 9th Edition WileyPLUS Registration Card + Loose-leaf Print Companion
Ch. 2 - Prob. 2.1ASCCh. 2 - Prob. 3.1ASCCh. 2 - Prob. 4.1ASCCh. 2 - Prob. 5.1ASCCh. 2 - Prob. 6.1ASCCh. 2 - Prob. 7.1ASCCh. 2 - Prob. 8.1ASCCh. 2 - Prob. 9.1ASCCh. 2 - Prob. 10.1ASCCh. 2 - Prob. 11.1ASC
Ch. 2 - Prob. 13.1ASCCh. 2 - Prob. 1QCh. 2 - Prob. 2QCh. 2 - Prob. 3QCh. 2 - Prob. 4QCh. 2 - Prob. 5QCh. 2 - Prob. 6QCh. 2 - Prob. 8QCh. 2 - Prob. 9QCh. 2 - Prob. 10QCh. 2 - Prob. 12QCh. 2 - Prob. 13QCh. 2 - Prob. 14QCh. 2 - Prob. 15QCh. 2 - Prob. 17QCh. 2 - Prob. 21QCh. 2 - Prob. 22QCh. 2 - Prob. 23QCh. 2 - Prob. 24QCh. 2 - Prob. 25QCh. 2 - Prob. 26QCh. 2 - Prob. 27QCh. 2 - Prob. 28QCh. 2 - Prob. 29QCh. 2 - Prob. 30QCh. 2 - Most students live in a dormitory or apartment...Ch. 2 - Prob. 32QCh. 2 - Describe, in general, how the J.D. Power Circle...Ch. 2 - Select a product that you own (like a cell phone,...Ch. 2 - Prob. 35QCh. 2 - Prob. 36QCh. 2 - Prob. 37QCh. 2 - Prob. 38QCh. 2 - Prob. 39QCh. 2 - Prob. 40QCh. 2 - Prob. 41QCh. 2 - Prob. 42QCh. 2 - Prob. 43QCh. 2 - Prob. 44QCh. 2 - Prob. 45QCh. 2 - Prob. 47QCh. 2 - Prob. 48QCh. 2 - Prob. 49QCh. 2 - Prob. 50QCh. 2 - Prob. 51QCh. 2 - Prob. 55QCh. 2 - Prob. 56QCh. 2 - Prob. 57QCh. 2 - Prob. 60QCh. 2 - Prob. 61QCh. 2 - Prob. 67QCh. 2 - Prob. 68QCh. 2 - Prob. 1PCh. 2 - The Backwoods American company in Problem 2-1...Ch. 2 - Prob. 3PCh. 2 - In Problem 2-3, if the direct manufacturing cost...Ch. 2 - Prob. 5PCh. 2 - The Colonial House Furniture Company manufactures...Ch. 2 - Prob. 8PCh. 2 - Prob. 9PCh. 2 - Prob. 10PCh. 2 - Prob. 11PCh. 2 - Prob. 12PCh. 2 - Prob. 14PCh. 2 - Prob. 1.1CPCh. 2 - Prob. 2.1CPCh. 2 - Prob. 3.1CPCh. 2 - Prob. 3.3CPCh. 2 - Prob. 3.4CPCh. 2 - Prob. 3.5CPCh. 2 - Prob. 3.6CPCh. 2 - Prob. 3.7CPCh. 2 - Prob. 3.8CPCh. 2 - Prob. 4.1CP
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