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CHAPTER 8 Requirements
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10. Draw a state diagram for the data item reservation in the B&B problem (see Problem 4.3). See Fig. 8-15.
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11. Draw a state diagram for the dental o ce problem (see Problem 4.2). See Fig. 8-16.
Start
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Quit
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Fig. 8-16.
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12. Draw a system diagram for the B&B system (see Problem 4.3). See Fig. 8-17.
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13. Draw a system diagram for the dental o ce system (see Problem 4.3). See Fig. 8-18.
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Fig. 8-18.
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Software Design
9.1 Introduction
Design is the process of applying various techniques and principles for the purpose of de ning a device, a process, or a system in su cient detail to permit its physical realization. 1 Design is also the most artistic or creative part of the software development process. Few rules can be written to guide design. The design process converts the what of the requirements to the how of the design. The results of the design phase should be a document that has su cient detail to allow the system to be implemented without further interaction with either the speci er or the user. The design process also converts the terminology from the problem space of the requirements to the solution space of the implementation. Some authors talk about object-oriented analysis (OOA) objects, which are in the problem/domain space, and object-oriented design (OOD) objects, which are in the solution/implementation space. For example, in the problem space we can talk about a realworld object like a person; in the solution space we can talk about a C class called person. Gunter et al.2 write about the phenomenon in the environment (world) and the phenomenon in the implementation (machine). A phenomenon can be visible or hidden. The user-oriented requirements may be expressed in terms of the phenomenon, hidden or visible, from the environment. However, the speci cation that will be used as the basis for development must sit between the environment and the implementation and must be expressed in terms of a visible phenomenon from each. This speci cation is the starting point for design and will be called the development speci cation in this book.
Taylor, An Interim Report of Engineering Design, MIT, 1959. Gunter, Gunter, Jackson, and Zave, A Reference Model for Requirements and Speci cations, IEEE Software, May/June 2000, 37 43.
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EXAMPLE 9.1
CHAPTER 9 Software Design
A robot is required to find specific brands of pop cans using a black-and-white camera and to return the cans to a recycling location. Such a statement can be the user-oriented requirements and consists of a phenomenon from the environment. However, the pop cans are hidden phenomenon in the environment. That is, the implementation will not know about pop cans; it will know about black-and-white images of pop cans. This is the visible phenomenon. When the specification that will be used as the starting point for design is written, it needs to talk in terms of these images. It will be assumed (and may need to be verified) that only real pop cans will give those images. For example, the problem will be much more difficult if the walls of the environment are covered with ads that contain images of pop cans.
EXAMPLE 9.2
Identify which phenomenon is in the environment and which is in the implementation in the library system. The physical book is an environment-hidden phenomenon. The system never knows about the book. When the librarian scans the book, he or she is really scanning a bar code. This bar code is not the ISBN but has to reflect possible multiple copies of a single book. This bar code is environment-visible. The implementation probably uses a different identifier or pointer for the book data. This internal identifier is implementation-hidden. The specification for development needs to be written in terms of the bar code on the book. Neither the physical book nor the internal identifier should be mentioned in the development specification.
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