By R. J. Wieringa
"This e-book provides a fresh yet severe and conscientious method of the paintings of constructing necessary software program. Roel Wieringa, being a thinker in addition to an engineer, is set to show realizing in addition to perform, and perception in addition to details. he's not blinded through ephemeral models in notation, yet attracts eclectically from either new and outdated principles and strategies. He appears severely at known strategies and notations, and judges basically what might be followed since it is easy and sturdy, what has to be supplemented from one other resource since it is poor, and what has to be discarded since it is just too complicated.-From the Foreword via Michael Jackson, self sufficient advisor, united kingdom"
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Extra resources for Design Methods for Reactive Systems: Yourdon, Statemate, and the UML
38 Chapter 4: Software Specifications Chapter 4: Software Specifications 39 Sometimes a quality attribute really is a cost for some stakeholder that must be kept as small as possible. For example, the maintainability and portability of a function indicate what the cost of providing this function is for the system maintainer. When we say that maintainability is high, we mean that the cost of maintenance is low. There are even more aspects relevant for software specification, including ergonomic, social, legal, and financial aspects.
This is done using a clock that counts the indicated time and printing devices. c. The information system of a supermarket: Would like it to cause stock to be replenished when it falls below a threshold. What it can do is print a report that stock is low or cause an EDI system to reorder stock. This is done by an interface to the printing facilities or an interface to the EDI system. It is not under the control of the system whether these actions lead to the desired effect of replenishing stock.
Answers 4. a. (i) Event: An up button on floor 1 has been pushed. (ii) Subject domain entity in whose life this occurs: An up button on floor 1. (iii) Observer: The wire connecting the button to the controller. (iv) Desired action: The motor in elevator shaft 3 starts rolling down its cable. 34 Chapter 3: Stimulus-Response Behavior Chapter 3: Stimulus-Response Behavior 35 (v) Subject domain entity in whose life the action occurs: The motor. (vi) Actor: The wire connecting the controller to the motor.