Software Engineering basics - Factors of Quality Software & Evolution of Quality Software

 

  1. Factors of Quality Software

  2. Evolution of Quality Software

1. Factors of Quality Software

These are the main things that make software "high quality." Think of them like ingredients in a good recipe. If you include them all, you get great software!

a. Functionality

  • The software does what it’s supposed to do.

  • Example: A calculator app gives the correct result when you add or multiply.

b. Reliability

  • The software works well without crashing or errors.

  • Example: An online exam system that doesn’t freeze during tests.

c. Usability

  • It’s easy to use and understand, even for beginners.

  • Example: A student attendance app with simple buttons and instructions.

d. Efficiency

  • The software uses less memory, battery, and time.

  • Example: A video app that runs smoothly without using too much data.

e. Maintainability

  • It’s easy to fix bugs or add new features.

  • Example: A developer can quickly update a school website with new events.

f. Portability

  • The software works on different devices or systems.

  • Example: A learning app that runs on Android, iPhone, and laptops.

2. Evolution of Quality Software

Now let’s see how software quality has improved over time — like how phones went from basic models to smart devices, software has also evolved.

1st Stage: Basic Functionality

  • Early software was simple and focused only on getting the job done.

  • Quality = It works.

2nd Stage: Reliability & Performance

  • People wanted software that didn’t crash and worked faster.

  • Quality = It works and doesn’t break.

3rd Stage: Usability

  • As more non-technical users started using software, it had to be user-friendly.

  • Quality = Easy to use.

4th Stage: Security and Maintainability

  • As software got more complex, it needed to be safe from hackers and easy to update.

  • Quality = Safe, stable, and easy to fix.

5th Stage: Modern Quality Focus

  • Today, quality includes everything: Speed, security, looks, ease of use, and user satisfaction.

  • Quality = A complete, smooth experience across all devices