Software Construction (Implementation)

• T h e f u n d a m e n t a l s o f s o f t w a r e construction include:
  • Minimizing complexity
  • Anticipating change
  • Constructing for verification
  • Standards in construction

• As functionality increases, software complexity increases.
• We always aim to reduce complexity throughout the lifecycle.
• Minimizing complexity is one the of strongest drivers in software construction.
• In software construction, reduced complexity is achieved through emphasizing code creation that is simple and readable.

• Most software will change over time, and the anticipation of change drives many aspects of software construction;
• Changes in the environments in which software operates also affect software in diverse ways.
• Anticipating change means software engineers build extensible software, so they can enhance a software product without disrupting the underlying structure.
• Anticipating change is supported by many specific coding techniques.

• A n t i c i p a t i o n o f c h a n g e a f f e c t h o w in different ways: software is constructed

1. Use of control structures
2. Handling of errors
3. Source code organization
4. Code documentation
5. Coding standards

• Restricting the use of complex or hard-to-understand language structures, among others.
• Applying external or internal development standards during construction helps achieve a project’s objectives for efficiency, quality, and cost.

Most modern software is constructed by reusing existing components or systems. When you are developing software, you should make as much use as possible of existing code.

▷ Develop new systems more quickly, with fewer development risks and lower costs.

▷ Reuse improves Software reliability.

Systematic reuse can enable significant software productivity, quality, and cost improvements.

Reuse has two closely related facets:

Construction for reuse: Create reusable software assets.

Construction with reuse: Reuse software assets in the construction of a new solution.

• Open source software is released under a license in which the copyright holder grants users the right to use, change, and distribute the software and its source code to anyone and for any purpose.
• Its roots are in the Free Software Foundation (www.fsf.org), which advocates that source code should not be proprietary but rather should always be available for users to examine and modify as they wish.