20 Critical Thinking Questions 5-1 ​ The analysts at Techno InfoSystems are considering the four-model approach to system development for a new client. If they make use of the four-model approach, which is a likely outcome?   a. The time required to develop the model will increase.   b. The requirements of a new information system will always be different from those of the current information system.   c. It will not be possible to get a clear picture of the current system functions before modifications are made.   d. Costs of developing a logical and physical model of the current system will decrease.

Practical Management Science
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Author:WINSTON, Wayne L.
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Chapter2: Introduction To Spreadsheet Modeling
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Critical Thinking Questions 5-1

The analysts at Techno InfoSystems are considering the four-model approach to system development for a new client.


If they make use of the four-model approach, which is a likely outcome?
  a.
The time required to develop the model will increase.
  b.
The requirements of a new information system will always be different from those of the current information system.
  c.
It will not be possible to get a clear picture of the current system functions before modifications are made.
  d.
Costs of developing a logical and physical model of the current system will decrease.
Expert Solution
Introduction

Every organization has to make numerous changes in its system. However, it is necessary to know the after-effects of the changes prior to implementing them.

Four model approach is a way to understand the differences created in the system before and after the application as this model creates four models namely:

  • physical model of the current system
  • logical model of the current system
  • logical model of the new system, and 
  • physical model of the new system.
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