Key person: Robert S. Taylor
Questions: 此理論欲解釋的問題(1986 .pp.1-2)
What does an information system do for human beings to justify its cost?
資訊系統為人類做了什麼,以證明其成本是有效的?
Can we relate the system costs (value added in the economist's term) to the user enhancements added by the system (value added in the context of this book)?
我們能將系統成本(經濟學上的加值)關聯到系統對使用者增強的部份(本書中所陳述的加值)?
What will be the cost in time, effort, and money that users, sitting in particular environment with particular problems, must invest to obtain useful information from any particular system?
在特定環境中,有著特定問題的使用者,必須要投入那些時間、努力與金錢的成本,才能從系統中獲得有用的資訊?
Assumptions::
the information system is a operating information system, its practice-driven and in “ordinary contexts of practical action”.
user-driven model, not content-driven or technology-driven model
命題(Arguments):
資訊系統是: (a)一加值程序。(b)任務與問題的資訊環境引發對解決方案資訊的需求。
Definition of information system: 資訊系統是能增強訊息潛在使用性的程序。 “information systems are a series of formal processes by which the potential usefulness of specific input messages being processed is enhanced.” 因此,通過此一系統的產品被加值了。
系統對訊息經過不同程序處理而加值。此一系列加值程序稱為
加值續譜(value-added spectrum)
訊息的
價值取決於使用者對此訊息利用的可能性(可用性)。