By Boudewijn Rempt
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Extra info for GUI programming with Python: using the Qt toolkit
Sample text
Regarding metrics, there is no standard way of measuring flexibility. The business measure is the cost of change in time and money, but this depends on what types of change can be anticipated. As flexibility, reliability, and availability are increased, manageability can suffer. Flexibility is also essential for keeping pace with rapid change. It’s enhanced when the middle-tier technology is a component-based solution that easily accommodates the integration of multiple technologies. Independence from hardware, operating system, and language creates the most adaptable and portable solutions.
Together, they produce a solution that meets the functional and nonfunctional constraints of the requirements. The solution describes how to perform the task. The architecture addresses structural issues, organizes subsystems, and assigns functionality to components. It defines the protocols for communication, synchronization, and data access; it physically allocates components to processors. Most important, it delivers the architectural design of the component interface specifications. Architectural Design and Principles 29 At this point, the designers step in and provide internal details of each component in the architecture, including an interface for each component class, the details for input/output, and the data structures and algorithms used.
Flexibility can be improved through location independence of application code. An example of flexibility would be a JEE system that uses internationalization code and property files to allow changes in the presentation language (for example, English to German). Regarding metrics, there is no standard way of measuring flexibility. The business measure is the cost of change in time and money, but this depends on what types of change can be anticipated. As flexibility, reliability, and availability are increased, manageability can suffer.