How To Test Software - Get Functional Defects

1. User Interface Issues

• Poorly designed user interfaces can cause several defects, such as non-responsive buttons, broken links, or incorrect field validations.

2. Data Integrity Issues

• Defects in data integrity may occur when the system doesn't validate the data or doesn't store it correctly. An example of this is if a user enters an email address with an incorrect format, and the system accepts it.

3. Functionality Issues

• Functionality defects occur when the system doesn't meet the business requirements. For example, if a banking application doesn't allow users to transfer funds between accounts or a social media platform doesn't enable users to create a new post.

4. Integration Issues

• Integration defects arise when different modules or systems don't work well together. An example of this is if a CRM system doesn't synchronize data with a marketing automation system.

5. Boundary and Limits Issues

• Boundary and limits issues may arise when the system doesn't handle inputs or outputs correctly that are at the boundaries or limits of the system. For instance, if a system doesn't allow negative values for certain inputs.

6. Business Logic Issues 

• Business logic defects occur when the system doesn't correctly implement the business rules or logic. For example, if a discount code isn't applied correctly or if a system calculates taxes incorrectly.

7. Compatibility Issues

• Compatibility defects may occur when the system doesn't work correctly with different browsers or operating systems. For example, if a website works fine on Google Chrome but doesn't display correctly on Mozilla Firefox.

8. Localization Issues

• Localization defects occur when the system doesn't support various languages or regions. For instance, if a website's interface is not translated into Spanish, which is a required language for the user.

9. Accessibility Issues

• Accessibility defects may arise when the system doesn't provide easy access to all users, such as people with disabilities. For example, if a website doesn't offer a screen reader or keyboard shortcuts.

10. Usability Issues

• Usability defects occur when the system doesn't provide a user-friendly experience. For instance, if a user has difficulty finding the right button or menu item or if the user manual is hard to understand.

 Functional defects can impact the quality and performance of a system, leading to a negative user experience. As testers, it is crucial to identify these defects early in the software development lifecycle to prevent them from affecting the system's overall quality.