Application of the Generational Variety Index: A Retrospective Study of iPhone Evolution

2012 ◽  
Author(s):  
Gopal Nadadur ◽  
Matthew B. Parkinson ◽  
Timothy W. Simpson
Keyword(s):  
Decision Making ◽  
Retrospective Study ◽  
Product Line ◽  
Design Decision ◽  
Design Recommendations ◽  
Design Evolution ◽  
The Future ◽  
Actual Design ◽  
Retrospective Nature ◽  
Generational Variety Index

The generational variety index (GVI) helps identify the components of product variants that are most likely to require redesign in the future. These components can then be embedded with the flexibility required for them to be easily modifiable; the remaining components can be designed into a platform. This paper describes the application of the GVI technique in studying the evolution of the Apple iPhone, which was first released in 2007 and has since undergone multiple redesigns. The analysis includes the five generations of the iPhone (original, 3G, 3GS, 4, and 4S) and focuses primarily on mechanical sub-systems. The results of the analysis and subsequent design recommendations are compared with the actual design evolution of the iPhone product line. For certain subsystems, this comparison reveals a divergence in Apple’s design decision-making from the evolution recommended by the GVI technique. Limitations include its retrospective nature and the use of only publicly available data.

scholarly journals Virtual Prototyping for Open Building Design

2011 ◽  
Vol 36 (4) ◽  
pp. 46-56
Author(s):  
ŞEule Taşlı Pektaş ◽  
Bülent Özgüç
Keyword(s):  
Decision Making ◽  
Virtual Prototyping ◽  
Building Design ◽  
Design Decision ◽  
Enabling Technology ◽  
Conventional Design ◽  
Building Systems ◽  
The Future ◽  
Decision Making Processes ◽  
Design Media

This paper re-visits the basic premises of open building: designing for change as well as for stability, including the users in the design decision-making processes, and disentangling the building systems into the levels and allowing replacement; then, addresses the limitations of conventional design media in terms of the capabilities to support these aims. It is discussed that the design media should be predictive, dynamic, and interactive. Virtual prototyping as an enabling technology is reviewed and proposals are made for the future use of this technology for open building design.

scholarly journals MULTI ATTRIBUTE ARCHITECTURE DESIGN DECISION FOR CORE ASSET DERIVATION

2015 ◽  
Vol 77 (9) ◽  
Author(s):  
Shahliza A. Halim ◽  
Dayang N. A. Jawawi ◽  
Noraini Ibrahim ◽  
M. Zulkifli M. Zaki ◽  
Safaai Deris
Keyword(s):  
Decision Making ◽  
Software Reuse ◽  
Product Line ◽  
Architecture Design ◽  
Design Decision ◽  
Functional Requirements ◽  
Detail Design ◽  
Software Product ◽  
Study Implementation

Software Product Line (SPL) is an effective approach in software reuse in which core assets can be shared among the members of the product line with an explicit treatment of variability. Core assets, which are developed for reuse in domain engineering, are selected for product specific derivation in application engineering. Decision making support during product derivation is crucial to assist in making multiple decisions during product specific derivation. Multiple decisions are to be resolved at the architectural level as well as the detailed design level, address the need for assisting the decision making process during core asset derivation. Architectural level decision making is based on imprecise, uncertain and subjective nature of stakeholder for making architectural selection based on non- functional requirements (NFR). Furthermore, detail design level involves the selection of suitable features which have the rationale behind each decision. The rationale for the selection, if not documented properly, will also result in loss of tacit knowledge. Therefore, a multi-attribute architecture design decision technique is proposed to overcome the above mentioned problem. The technique combines Fuzzy Analytical Hierarchy Process (FAHP) with lightweight architecture design decision documentation to support the decision making during core asset derivation. We demonstrate our approach using the case study of Autonomous Mobile Robot (AMR). The case study implementation shows showed that the proposed technique supports software engineer in the process of decision making at the architecture and detail design levels.

Manufacturing Investment and Allocation in Product Line Design Decision-Making

2005 ◽  
Author(s):  
Jeremy J. Michalek ◽  
Oben Ceryan ◽  
Panos Y. Papalambros ◽  
Yoram Koren
Keyword(s):  
Decision Making ◽  
Engineering Design ◽  
Product Line ◽  
Manufacturing Cost ◽  
Design Decision ◽  
Product Line Design ◽  
Product Decision ◽  
Market Consequences ◽  
Line Design ◽  
Is Design

An important aspect of product development is design for manufacturability (DFM) analysis that aims to incorporate manufacturing requirements into early product decision-making. Existing methods in DFM seldom quantify explicitly the tradeoffs between revenues and costs generated by making design choices that may be desirable in the market but costly to manufacture. This paper builds upon previous work coordinating models for engineering design and marketing product line decision-making by incorporating quantitative models of manufacturing investment and production allocation. The result is a methodology that considers engineering design decisions quantitatively in the context of manufacturing and market consequences in order to resolve tradeoffs, not only among performance objectives, but also between market preferences and manufacturing cost.

Floor finish selection in the design of healthcare facilities: a survey of facility managers

Facilities ◽  
2019 ◽  
Vol 37 (9/10) ◽  
pp. 571-599 ◽  
Author(s):  
Manish K. Dixit ◽  
Shashank Singh ◽  
Sarel Lavy ◽  
Wei Yan ◽  
Fatemeh Pariafsai ◽  
...  
Keyword(s):  
Decision Making ◽  
Selection Criteria ◽  
Healthcare Facility ◽  
Product Line ◽  
Healthcare Sector ◽  
Maintenance Cost ◽  
Design Decision ◽  
Content Type ◽  
Healthcare Facilities ◽  
Survey Results

Purpose The purpose of this study is to create a knowledge base for decision-making in healthcare design by seeking, analyzing and discussing the preferences of facility managers of healthcare facilities regarding floor finishes and their selection criteria. The goal is to enable a simplified and holistic selection of floor finishes based on multiple criteria. The authors studied floor finish selection in three healthcare units: emergency, surgery and in-patient units. Design/methodology/approach The authors completed a literature review to identify types of floor finishes currently used in healthcare facilities and the criteria applied for their selection. Using the literature survey results, a questionnaire was designed and administered to healthcare facility managers. The descriptive statistical analysis and the Friedman and Wilcoxon signed-ranks tests were used for reporting and analyzing the survey data. Findings The top five floor finishes used in the healthcare sector were identified as vinyl flooring, vinyl composite tile (VCT), rubber, linoleum and ceramic flooring. The top five selection criteria for floor finishes were durability, infection control, ease of maintenance, maintenance cost and user safety. The non-parametric test results show that the floor finish rankings and selection criteria were similar in the three healthcare units under study. Originality/value The most significant contribution of this research is to the design decision-making process of healthcare facilities. These results offer an understanding of what floor finishes are preferred by healthcare facility managers and why. This knowledge is crucial for designers and facility managers to make informed choices and floor finish manufacturers to keep their product line relevant to the industry.

FISCAL PESSIMISM IN HISTORICAL PERSPECTIVE: TOCQUEVILLE'S CROSS REVISITED

2021 ◽  
pp. 1-21
Author(s):  
Isabel Cepeda ◽  
Pedro Fraile Balbín
Keyword(s):  
Economic Growth ◽  
Decision Making ◽  
Political Economy ◽  
Historical Perspective ◽  
Income Redistribution ◽  
Government Control ◽  
Economic Decision ◽  
Modern School ◽  
Economic Decision Making ◽  
The Future

ABSTRACT This paper explores Alexis de Tocqueville's thought on fiscal political economy as a forerunner of the modern school of preference falsification and rational irrationality in economic decision making. A good part of the literature has misrepresented Tocqueville as an unconditional optimist regarding the future of fiscal moderation under democracy. Yet, although he initially shared the cautious optimism of most classical economists with respect to taxes under extended suffrage, Tocqueville's view turned more pessimistic in the second volume of his Democracy in America. Universal enfranchisement and democratic governments would lead to higher taxes, more intense income redistribution and government control. Under democracy, the continuous search for unconditional equality would eventually jeopardise liberty and economic growth.

Redisign of the Air Traffic Control System-Moving People through Distributed Management

1978 ◽  
Vol 22 (1) ◽  
pp. 485-485
Author(s):  
John G. Kreifeldt
Keyword(s):  
Decision Making ◽  
Control System ◽  
Traffic Control ◽  
Air Traffic Control ◽  
Negative Impact ◽  
Air Traffic ◽  
Critical Function ◽  
Congressional Hearings ◽  
The Future ◽  
Traffic Control System

The present national Air Traffic Control system is a ground-centralized, man intensive system which through design allows relatively little meaningful pilot participation in decision making. The negative impact of this existing design can be measured in delays, dollars and lives. The FAA's design plans for the future ATC system will result in an even more intensive ground-centralized system with even further reduction of pilot decision making participation. In addition, controllers will also be removed from on-line decision making through anticipated automation of some or all of this critical function. Recent congressional hearings indicate that neither pilots nor controllers are happy or sanguine regarding the FAA's design for the future ATC system.

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