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本論文旨在釐清設計者與使用者之間互動的社會交換關係，從社會學、古
典經濟學與消費者行為學等不同領域的角度，重新審視這個真實存在的現
象，並根據其中關於價值原理、需求法則、以及消費者涉入與決策等概念
，具體建構出「使用者對產品中單一功能之需求彈性」的推導模式；其次
探討品質管理之觀點，將研究所得之功能需求彈性引入幾種主要的系統性
設計模式概念中，說明這種動態性的指標如何影響系統中之決策程序。全
文包括了以下三個重點：‧使用者需求與功能彈性之理論分析、概念形成
以及推導模式之建構。‧根據實驗與無差異曲線法驗證使用者需求現象，
並建立自動化程序。‧說明功能需求彈性於系統性設計模式中之應用與影
響。 作者所提出之功能需求彈性乃經由修正古典經濟學中之需求法則而
建立，融合了社會學之交換理論對於價值與品質管理對於品質特性之觀點
，引入一般系統性設計模式與人機動態模式之決策黑箱中加以應用，最終
目的在藉由對使用者與設計者互動關係之強調，而能有效提升設計效益與
彈性。經過實驗調查與無差異曲線分析法，對設計科系學生操作單眼電子
式相機之研究結果證明，使用者需求現象的確存在，並足以透過進一步對
功能彈性之描述，協助設計者在應用既有系統性設計模式的同時即大幅提
升其效益，對於設計實務與學術的助益匪淺。
This study is focused on an exchanging relationship between
designers and users, it trys to discuss a really existing phen-
menon in design from several different viewpoints. In this ar-
icle, according to those concepts including Value Theory in S-
ciology, Law of Demand in Economics, and Decision-Making Meth-
dology, etc., it has not only built up an operating model
andprogram shell for calculating user-demand*s elasticity of
anyunction in one product trough experimentation; but
introducedhe elasticity metioned above into general systematic
processs a dynamic index. Whole study was based on three issues:
EThe distinction between user''s and consumer''s demand,the con-
ept and theories about elasticity, and the calculating mod-l
for elasticity in design process.EThe proof of the phenomenon
of user demand by statistical re-ression / analysis of indiffer-
ent-curve, and automation ofll steps.EThe impact and
application of demand elasticity on systematicesign process.t
proposed an experiment with electonic single-len ca-era to
prove the user demand and a simple example to introduceow it
applied, the purpose overall is to raise the effect inesign
itself by emphasizing on such an interactive relationsh-p. To
sum up, the methodology which extract an logical modelrom
social reality could be a reasonable way in all the otheresign
domains, and it would be absolutely helpful for both de-igners
and users.
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