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1 | \chapter{Introduction} |
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2 | |
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3 | Geant4 exploits advanced software engineering techniques based on the |
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4 | Booch/UML Object Oriented Methodology and follows the evolution of the |
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5 | ESA Software Engineering Standards for the development process. The |
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6 | "spiral", or iterative, approach has been adopted. User requirements |
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7 | were collected in the initial phase and problem domain decomposition, |
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8 | object-oriented methods, and CASE tools were used for analysis and design. |
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9 | This produced a clear hierarchical structure of sub-domains linked by a |
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10 | uni-directional flow of dependencies. This led to a software product |
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11 | which is modular and flexible (a toolkit) and in which the physics |
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12 | implementation is transparent and open to user validation of physics |
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13 | predictions. It allows the user to understand, customize and extend the |
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14 | toolkit in all domains. At the same time the modular architecture allows |
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15 | the user to load only needed components. |
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16 | |
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