Table of Contents
Software Metrics and Code Analysis Tools
The problem with quick and dirty...is that dirty remains long after quick has been forgotten.
Code quality is a vital aspect of software development, but it is impossible to measure without some kind of definition. That also turns out to be difficult because quality is such a generic term. One way to appraoch the question of how to measure quality is first to divide the overall concept into internal and external parts.
Internal code quality refers to the attributes of the code itself — its structure, readability, and organization. This type of quality directly influences how easily other developers can understand, modify, and extend the code. Factors like readability, modularity, adherence to coding standards, and simplicity fall under internal quality. Clean, well-organized code with clear comments and consistent naming conventions makes development faster, reduces the likelihood of bugs, and improves collaboration among team members.
External code quality, on the other hand, pertains to how well the software meets its functional and non-functional requirements when deployed. It focuses on the user’s experience and includes factors like performance, reliability, security, and usability. While internal quality concerns how the code works under the surface, external quality focuses on how well the application meets end-user needs and maintains stability in production environments.
Addressing both internal and external quality criteria is essential for sustainable development. High internal quality supports future updates, minimizes technical debt, and reduces costs associated with maintaining and evolving the software. High external quality ensures that the software performs well in real-world scenarios, providing a reliable and satisfying experience for users.
In these instructional notes, we will explore the specific criteria that define internal and external code quality, methods for assessing each type, and best practices for achieving quality in both areas. By understanding and applying these criteria, developers can create software that is efficient, maintainable, and reliable, leading to both immediate and long-term success in development projects.