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Beni Asllani University of Tennessee at Chattanooga
Chapter 5 Products and Services Operations Management - 5th Edition Roberta Russell & Bernard W. Taylor, III Beni Asllani University of Tennessee at Chattanooga Copyright 2006 John Wiley & Sons, Inc.
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Lecture Outline Design Process Reducing Time-to-Market
Improving Quality of Design Special Considerations in Service Design Copyright 2006 John Wiley & Sons, Inc.
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Design Process Effective design can provide a competitive edge
matches product or service characteristics with customer requirements ensures that customer requirements are met in the simplest and least costly manner reduces time required to design a new product or service minimizes revisions necessary to make a design workable Copyright 2006 John Wiley & Sons, Inc.
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Design Process (cont.) Product design Service design
defines appearance of product sets standards for performance specifies which materials are to be used determines dimensions and tolerances Service design specifies what physical items, sensual benefits, and psychological benefits customer is to receive from service defines environment in which service will take place Copyright 2006 John Wiley & Sons, Inc.
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New product or service launch Revising and testing prototypes
Design Process (cont.) Pilot run and final tests New product or service launch Final design & process plans Idea generation Feasibility study Product or service concept Performance specifications Functional design Form design Production design Revising and testing prototypes Design specifications Manufacturing or delivery specifications Suppliers R&D Customers Marketing Competitors Copyright 2006 John Wiley & Sons, Inc.
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Idea Generation Sources
Company’s own R&D department Customer complaints or suggestions Marketing research Suppliers Salespersons in the field Factory workers New technological developments Competitors Copyright 2006 John Wiley & Sons, Inc.
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Idea Generation Sources (cont.)
Perceptual Maps Visual comparison of customer perceptions Benchmarking Comparing product/service against best-in-class Reverse engineering Dismantling competitor’s product to improve your own product Copyright 2006 John Wiley & Sons, Inc.
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Perceptual Map of Breakfast Cereals
HIGH NUTRITION LOW NUTRITION GOOD TASTE BAD TASTE Cocoa Puffs Rice Krispies Wheaties Cheerios Shredded Wheat Rice Krispies Cheerios Wheaties Shredded Wheat Copyright 2006 John Wiley & Sons, Inc.
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Feasibility Study Market analysis Economic analysis
Technical/strategic analysis Performance specifications Copyright 2006 John Wiley & Sons, Inc.
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Rapid Prototyping Build a prototype Test prototype Revise design
form design functional design production design Test prototype Revise design Retest Copyright 2006 John Wiley & Sons, Inc.
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Form and Functional Design
Form Design how product will look? Functional Design reliability maintainability usability Copyright 2006 John Wiley & Sons, Inc.
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Computing Reliability
0.90 0.90 x 0.90 = 0.81 Components in series Copyright 2006 John Wiley & Sons, Inc.
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Computing Reliability
(1-0.95) = 0.995 Components in parallel 0.95 0.90 R2 R1 Copyright 2006 John Wiley & Sons, Inc.
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System Reliability 0.92 0.90 0.98 0.98 x 0.99 x 0.98 = 0.951
0.92+(1-0.92)(0.90)=0.99 0.98 0.98 x 0.99 x 0.98 = 0.951 Copyright 2006 John Wiley & Sons, Inc.
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System Availability (SA)
MTBF MTBF + MTTR where: MTBF = mean time between failures MTTR = mean time to repair Copyright 2006 John Wiley & Sons, Inc.
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System Availability (cont.)
PROVIDER MTBF (HR) MTTR (HR) A B C SAA = 60 / (60 + 4) = or 93.75% SAB = 36 / (36 + 2) = or 97.26% SAC = 24 / (24 + 1) = or 94.73% Copyright 2006 John Wiley & Sons, Inc.
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Usability Ease of use of a product or service ease of learning
ease of remembering how to use frequency and severity of errors user satisfaction with experience Copyright 2006 John Wiley & Sons, Inc.
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Production Design Simplification Standardization Modularity
reducing number of parts, assemblies, or options in a product Standardization using commonly available and interchangeable parts Modularity combining standardized building blocks, or modules, to create unique finished products Copyright 2006 John Wiley & Sons, Inc.
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Design Simplification
(a) Original design Assembly using common fasteners (b) Revised design One-piece base & elimination of fasteners (c) Final design Design for push-and-snap assembly Copyright 2006 John Wiley & Sons, Inc.
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Final Design and Process Plans
workable instructions necessary equipment and tooling component sourcing recommendations job descriptions and procedures computer programs for automated machines Final design detailed drawings and specifications for new product or service Copyright 2006 John Wiley & Sons, Inc.
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Reducing Time-to-Market
Establish multifunctional design teams Make design decisions concurrently rather than sequentially Design for manufacture and assembly Use technology in the design process Engage in collaborative design Copyright 2006 John Wiley & Sons, Inc.
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Design Team Copyright 2006 John Wiley & Sons, Inc.
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Concurrent Design A new approach to design that involves simultaneous design of products and processes by design teams Improves quality of early design decisions Involves suppliers Incorporates production process Uses a price-minus system Scheduling and management can be complex as tasks are done in parallel Copyright 2006 John Wiley & Sons, Inc.
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Design for Manufacture and Assembly (DFMA)
Design for assembly a set of procedures for: reducing number of parts in an assembly evaluating methods of assembly determining an assembly sequence Design for manufacture design a product for easy and economical production Copyright 2006 John Wiley & Sons, Inc.
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DFM Guidelines Minimize number of parts and subassemblies
Avoid tools, separate fasteners, and adjustments Use standard parts when possible and repeatable, well-understood processes Design parts for many uses, and modules that can be combined in different ways Design for ease of assembly, minimal handling, and proper presentation Allow for efficient and adequate testing and replacement of parts Copyright 2006 John Wiley & Sons, Inc.
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Technology in the Design Process
Computer Aided Design (CAD) assists in creation, modification, and analysis of a design includes computer-aided engineering (CAE) tests and analyzes designs on computer screen computer-aided manufacturing (CAM) ultimate design-to-manufacture connection Copyright 2006 John Wiley & Sons, Inc.
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Collaborative Design A software system for collaborative design and development among trading partners Follows life cycle of the product Accelerates product development, helps to resolve product launch issues, and improves quality of the design Designers can conduct virtual review sessions test “what if” scenarios assign and track design issues communicate with multiple tiers of suppliers create, store, and manage project documents Copyright 2006 John Wiley & Sons, Inc.
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Improving Quality of Design
Review designs to prevent failures and ensure value Design for environment Measure design quality Use quality function deployment Design for robustness Copyright 2006 John Wiley & Sons, Inc.
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Design Review Failure mode and effects analysis (FMEA)
a systematic method of analyzing product failures Fault tree analysis (FTA) a visual method for analyzing interrelationships among failures Value analysis (VA) helps eliminate unnecessary features and functions Copyright 2006 John Wiley & Sons, Inc.
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FMEA for Potato Chips Failure Mode Cause of Effect of Corrective
Action Stale low moisture content expired shelf life poor packaging tastes bad won’t crunch thrown out lost sales add moisture cure longer better package seal shorter shelf life Broken too thin too brittle rough handling rough use can’t dip poor display injures mouth chocking perceived as old change recipe change process change packaging Too Salty outdated receipt process not in control uneven distribution of salt eat less drink more health hazard experiment with recipe experiment with process introduce low salt version Copyright 2006 John Wiley & Sons, Inc.
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Fault tree analysis (FTA)
Copyright 2006 John Wiley & Sons, Inc.
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Value analysis (VA) Can we do without it?
Does it do more than is required? Does it cost more than it is worth? Can something else do a better job? Can it be made by a less costly method? with less costly tooling? with less costly material? Can it be made cheaper, better, or faster by someone else? Copyright 2006 John Wiley & Sons, Inc.
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Design for Environment
designing a product from material that can be recycled design from recycled material design for ease of repair minimize packaging minimize material and energy used during manufacture, consumption and disposal Extended producer responsibility holds companies responsible for their product even after its useful life Copyright 2006 John Wiley & Sons, Inc.
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Design for Environment (cont.)
Copyright 2006 John Wiley & Sons, Inc.
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Measure Design Quality
% of revenue from new products or services % of products capturing 50% or more of market % of process initiatives yielding a 50% or more improvement in effectiveness % of suppliers engaged in collaborative design % of parts that can be recycled % of parts used in multiple products % of parts with no engineering change orders Average number of components per product Things gone wrong (TGW) Copyright 2006 John Wiley & Sons, Inc.
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Quality Function Deployment (QFD)
Translates voice of customer into technical design requirements Displays requirements in matrix diagrams first matrix called “house of quality” series of connected houses Copyright 2006 John Wiley & Sons, Inc.
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Design characteristics Customer requirements Competitive assessment
House of Quality Trade-off matrix Design characteristics Customer requirements Target values Relationship matrix Competitive assessment Importance 1 2 3 4 5 6 Copyright 2006 John Wiley & Sons, Inc.
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Competitive Assessment of Customer Requirements
Irons well Easy and safe to use Competitive Assessment Customer Requirements Presses quickly 9 B A X Removes wrinkles 8 AB X Doesn’t stick to fabric 6 X BA Provides enough steam AB X Doesn’t spot fabric 6 X AB Doesn’t scorch fabric 9 A XB Heats quickly 6 X B A Automatic shut-off ABX Quick cool-down 3 X A B Doesn’t break when dropped 5 AB X Doesn’t burn when touched 5 AB X Not too heavy 8 X A B Competitive Assessment of Customer Requirements Copyright 2006 John Wiley & Sons, Inc.
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From Customer Requirements to Design Characteristics
Time required to reach 450º F Time to go from 450º to 100º Protective cover for soleplate Material used in soleplate Flow of water from holes Energy needed to press Thickness of soleplate Automatic shutoff Size of soleplate Number of holes Weight of iron Size of holes Customer Requirements Presses quickly Removes wrinkles Doesn’t stick to fabric Provides enough steam Doesn’t spot fabric Doesn’t scorch fabric Heats quickly Automatic shut-off Quick cool-down Doesn’t break when dropped Doesn’t burn when touched Not too heavy Irons well Easy and safe to use From Customer Requirements to Design Characteristics Copyright 2006 John Wiley & Sons, Inc.
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Tradeoff Matrix + - Copyright 2006 John Wiley & Sons, Inc.
Protective cover for soleplate Time to go from 450º to 100º Time required to reach 450º Material used in soleplate Flow of water from holes Energy needed to press Thickness of soleplate Automatic shutoff Size of soleplate Number of holes Weight of iron Size of holes - + Tradeoff Matrix Copyright 2006 John Wiley & Sons, Inc.
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Targeted Changes in Design
Time to go from 450º to 100º Protective cover for soleplate Time required to reach 450º Material used in soleplate Flow of water from holes Energy needed to press Thickness of soleplate Automatic shutoff Size of soleplate Number of holes Weight of iron Size of holes Units of measure ft-lb lb in. cm ty ea mm oz/s sec sec Y/N Y/N Iron A x4 2 SS N Y Iron B x4 1 MG N Y Our Iron (X) x5 4 T N Y Estimated impact Estimated cost Targets x5 3 SS Design changes * * * * * * * Objective measures Copyright 2006 John Wiley & Sons, Inc.
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Completed House of Quality
SS = Silverstone MG = Mirorrglide T = Titanium Completed House of Quality Copyright 2006 John Wiley & Sons, Inc.
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A Series of Connected QFD Houses
Customer requirements House of quality Product characteristics A-1 Parts deployment Part characteristics A-2 Process planning Process characteristics A-3 Operating requirements Operations A-4 Copyright 2006 John Wiley & Sons, Inc.
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Benefits of QFD Promotes better understanding of customer demands
Promotes better understanding of design interactions Involves manufacturing in design process Breaks down barriers between functions and departments Provides documentation of design process Copyright 2006 John Wiley & Sons, Inc.
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Design for Robustness Robust product Robust design
designed to withstand variations in environmental and operating conditions Robust design yields a product or service designed to withstand variations Controllable factors design parameters such as material used, dimensions, and form of processing Uncontrollable factors user’s control (length of use, maintenance, settings Copyright 2006 John Wiley & Sons, Inc.
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Tolerance and Consistency
allowable ranges of variation in the dimension of a part Consistency consistent errors are easier to correct than random errors parts within tolerances may yield assemblies that are not within limits consumers prefer product characteristics near their ideal values Copyright 2006 John Wiley & Sons, Inc.
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Taguchi’s Quality Loss Function
Quantifies customer preferences toward quality Emphasizes that customer preferences are strongly oriented toward consistently Design for Six Sigma (DFSS) Quality Loss Lower tolerance limit Target Upper Copyright 2006 John Wiley & Sons, Inc.
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Special Considerations in Service Design
Services are intangible Service output is variable Service have higher customer contact Services are perishable Service inseparable from delivery Services tend to be decentralized and dispersed Services are consumed more often than products Services can be easily emulated Copyright 2006 John Wiley & Sons, Inc.
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Service Design Process
Performance Specifications Service Delivery Specifications Physical items Sensual benefits Psychological benefits Design Specifications Service Provider Customer Customer requirements Customer expectations Activities Facility Provider skills Cost and time estimates Schedule Deliverables Location Service Concept Service Package Desired service experience Targeted customer Service Design Process Copyright 2006 John Wiley & Sons, Inc.
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Service Design Process (cont.)
Service concept purpose of a service; it defines target market and customer experience Service package mixture of physical items, sensual benefits, and psychological benefits Service specifications performance specifications design specifications delivery specifications Copyright 2006 John Wiley & Sons, Inc.
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High v. Low Contact Services
Design Decision High-Contact Service Low-Contact Service Facility location Convenient to customer Near labor or transportation source Facility layout Must look presentable, accommodate customer needs, and facilitate interaction with customer Designed for efficiency Source: Adapted from R. Chase, N. Aquilano, and R. Jacobs, Operations Management for Competitive Advantage (New York:McGraw-Hill, 2001), p. 210 Copyright 2006 John Wiley & Sons, Inc.
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High v. Low Contact Services (cont.)
Design Decision High-Contact Service Low-Contact Service Quality control More variable since customer is involved in process; customer expectations and perceptions of quality may differ; customer present when defects occur Measured against established standards; testing and rework possible to correct defects Capacity Excess capacity required to handle peaks in demand Planned for average demand Source: Adapted from R. Chase, N. Aquilano, and R. Jacobs, Operations Management for Competitive Advantage (New York:McGraw-Hill, 2001), p. 210 Copyright 2006 John Wiley & Sons, Inc.
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High v. Low Contact Services (cont.)
Design Decision High-Contact Service Low-Contact Service Worker skills Must be able to interact well with customers and use judgment in decision making Technical skills Scheduling Must accommodate customer schedule Customer concerned only with completion date Source: Adapted from R. Chase, N. Aquilano, and R. Jacobs, Operations Management for Competitive Advantage (New York:McGraw-Hill, 2001), p. 210 Copyright 2006 John Wiley & Sons, Inc.
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High v. Low Contact Services (cont.)
Design Decision High-Contact Service Low-Contact Service Service process Mostly front-room activities; service may change during delivery in response to customer Mostly back-room activities; planned and executed with minimal interference Service package Varies with customer; includes environment as well as actual service Fixed, less extensive Source: Adapted from R. Chase, N. Aquilano, and R. Jacobs, Operations Management for Competitive Advantage (New York:McGraw-Hill, 2001), p. 210 Copyright 2006 John Wiley & Sons, Inc.
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Copyright 2006 John Wiley & Sons, Inc. All rights reserved
Copyright 2006 John Wiley & Sons, Inc. All rights reserved. Reproduction or translation of this work beyond that permitted in section 117 of the 1976 United States Copyright Act without express permission of the copyright owner is unlawful. Request for further information should be addressed to the Permission Department, John Wiley & Sons, Inc. The purchaser may make back-up copies for his/her own use only and not for distribution or resale. The Publisher assumes no responsibility for errors, omissions, or damages caused by the use of these programs or from the use of the information herein. Copyright 2006 John Wiley & Sons, Inc.
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