architectural modeller | design documentation | technology that others are also reusing | developing reusable components | significantly less knowledge about modelling than about design and programming | the interface of a package as simple as possible to simplify its use and testing | all the use cases associated with the software product | to reuse components in which they lack confidence | software development team | the set of use cases is complete and that they are expressed consistently and unambiguously | modeller | 9.4 - Software Architecture | requirements | software that is easy to design and maintain and which has parts that are easy to reuse | when they deliver product, not on its quality level | the customer's business environment, their problems and the available technology which can be used to solve the problems | new libraries, APIs and frameworks because- developing anything reusable is seen as not directly benefiting the current customer
- If a developer has painstakingly developed a high-quality reusable component, but management only rewards the efforts of people who create the more visible 'final product', then that developer will be reluctant to spend time on reusable components in the future
- Efforts at creating reusable software are often done in a hurry and without enough attention to quality. People thus lose confidence in the resulting components, and in the concepts of reuse and reusability
| circular dependencies among packages | several evaluators to independently perform heuristic evaluations | architectural modelling | a design only after it is complete | design principles | UML diagrams | software | several months on a testing team; this will heighten her awareness of quality problems she should avoid when she returns to designing software | the project manager about any problems | software development time because it is very hard for people to assess the quality of software or to appreciate the amount of work involved in its development | custom software | that developing reusable components will normally simplify the resulting design, independently of whether reuse actually occurs | architectural model by following these steps iteratively: - Sketch an outline of the architecture, based on the principal requirements and use cases. Determine the main components that will be needed, such as databases, particular hardware devices and the main software subsystems
- Refine the architecture by identifying the main ways in which the components will interact, and by identifying the interfaces between them. Decide how each piece of data and functionality will be distributed among the various components
- Consider each use case and adjust the architecture to make it realizable
- Mature the architecture as you define the final class diagrams and interaction diagrams
| rewarding career, recognition, or the challenge of solving difficult problems or by being a well-respected 'guru' in a certain area of expertise | the use case or use cases which are central to the system, which represent a high risk because of problematic implementation, or which have high political or commercial value | adequately involve users in the development process |