Question

How the measures can help the quality of a component level design?

Answer 1

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This lesson outlines component-based design and the steps associated with it. Examples of unified modeling language (UML) activity diagrams and state charts are also included.

Component-Level Design

Component-level design, also known as component-based software engineering (CBSE) or Component-Based Design (CBD), is an approach to software development that emphasizes the concept of reusable components. In CBSE, the preferred method is to create a system using 'off-the-shelf' components and employing a 'buy, don't build' mentality. Only when necessary are custom components built, as opposed to building the entire system from scratch.
The main rationale behind this approach is to significantly minimize system cost and deployment time. Other benefits include higher software quality (although sometimes this is debatable), and the ability to more easily identify software issues. Whether or not CBSE results in higher quality software is a topic for discussion because the quality of a single component does not necessarily reflect the quality of the system as a whole. On the other hand, issues are more easily detected because they can be isolated to a specific component. In the case of a custom built component, this is harder to do.

Steps for Component-Level Design

The development of any software system or application follows roughly the same steps:

Requirements analysis and specification

System and software design

Implementation and unit testing

System integration

System verification and validation

Operation support and maintenance

Disposal (though this step is often omitted)

Each of these will be discussed in more detail the sections below.

Requirements Analysis and Specification

Requirements analysis in software engineering essentially identifies a problem and then determines the requirements the solution must meet to be considered successful. In CBSE, a main consideration at this stage is whether solution can be created or not using existing software components.



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