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Common Types of Software Bugs


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Dealing with bugs is one of the biggest headaches in the software development lifecycle. No matter how carefully someone writes code, it’s impossible to create a software product that works perfectly every time. Skipping detailed testing often causes major issues later on.

Software bugs are inevitable. You and your team will run into various bugs that can affect your project in many ways. It’s important to know about the different kinds of bugs so you can make a solid plan for successful software testing. Simply put, be prepared for software to sometimes give wrong or unexpected results.

Now, let’s talk about the most common types of software bugs you might find during software testing, to help you know what to watch out for.

Different Types of Bugs in Software Testing

There are various types of bugs can manifest during software testing, requiring effective strategies that can be used in identifying and addressing them for smooth and timely software releases, including:

1. Logical Bugs

A logical bug affects the workflow of software, resulting in undesired functionality or output. These bugs can cause the application to exhibit unwanted behavior or sudden crash. Logical bugs occur due to unstructured code or lack of proper business planning in the formulation stages. For example, when assigning variables to your application, a mismatch may occur when placing them to values, resulting in unexpected behavior or output.

2. Security Bugs

Security aspects can not be left out in software development processes. In this case, security bugs are a major concern. They require high surveillance and urgency in handling due to their sensitivity. This requires regular monitoring of the software because bugs can affect the application functionalities as well as the development and testing process. 

3. Functional Bugs

Functional bugs occur when a specific component of a user interface in your software is not working as intended. For example, in a messaging app, messages may be delivered out of order. This means users are likely to experience confusion between older and newer messages, disrupting the flow of conversations and software usability.

4. Compatibility Bugs

Compatibility bugs occur when software components fail to function as desired, causing issues in performance. These errors of bugs emerge because of different aspects, including operating systems, software versions, compatibility errors, or mismatches in programming languages. This means developers must be ready to experience the challenges of bug fixes, inconsistencies in the implementation of industry standards, old features, and API changes.

5. Performance Bugs

If you have ever experienced challenges related to responsiveness, speed, or efficiency when interacting with a software application, then these are caused by performance bugs. They lead to performance errors due to delays and lags, affecting the overall user experience. The reasons for these performance bugs to occur include poorly optimized code, memory leaks, suboptimal database queries, and inefficient algorithms.

6. Workflow Bugs

Workflow bugs are usually experienced by a user when using the software application. Let’s consider a scenario on a project management mobile application where users rely on effective workflow to create, assign, and attract tasks within their teams. A recent update enhanced the application collaboration features, introducing unexpected workflow bugs. The workflow bug first manifests when a user wants to assign a task to a team member who has been newly introduced to the project. In this case, the task assignment process to each user is disrupted as well as creating confusion.

7. Unit Level Bugs

Unit-level bugs refer to issues that occur to a specific component of software during development. An example of this bug in software is a web development project, particularly in a form validation function. In this case, the validation function allows submission without the “@” symbol in the email addresses, leading to data integrity issues. The developer can rectify this by enforcing the “@” symbol to promote the validation logic.

8. System Level Integration Bugs

System-level integration bugs occur when components used to develop a system fail to coordinate to give out the desired output. Let’s consider a scenario involving a mobile application that integrates with a cloud-based backend for data synchronization. In this case, an update may be done on the mobile application, and a request may be sent using a new protocol. However, the backend server expects requests in the older version. The mismatch might expose sensitive data. This will be a perfect example of system-level integration.

9. Critical Bugs

Critical bugs are the worst bugs in the category, as they can affect the functionality of the entire software. They are considered to be the most sensitive bugs because they make software testing difficult until the bugs are no longer available in the software.

Strategies to Address Software Bugs


Finding software bugs is a requirement that the software development team and testers should do to find underlying software bugs and ensure each component functions as intended. Here are several ways to locate software defects and bugs:

Unit Testing

Conduct thorough unit testing for each component to ensure they are functioning as expected. In this case, automated testing frameworks can be used to catch bugs early in the software development process.

Test Cases

You should prepare well-thought-out, functional test cases that will help you analyze the risk of the software being exposed to bugs. These test cases also help in assessing how the application will perform under different circumstances.

Code Reviews

It is necessary for developers to review each other’s code. This is helpful in identifying issues that may have been overlooked in the development process. In simple terms, having a fresh set of eyes is advisable for ensuring the code is clean.

 You may apply these steps to make your testing processes interesting.

1. Identify the source of the bug

2. Look for any kind of coding or syntax errors. errors

3. Work on the code and rerun

4. Ensure optimal performance

5. Test the code again to find any underlying bugs.

User Feedback

Users’ points of view are crucial in figuring out how components are performing. They offer valuable insights that might not be recognized during the development process.

Regression Testing

You need to regularly perform regression testing to ensure that any changes made to the code do not introduce new bugs or other errors in existing functionality. This process is useful in identifying software flaws or sensitive bugs that may affect the quality of software products before release or production environment.

The Impact of Bugs on Software Quality and Development Costs

Software bugs can cause severe consequences for software systems, organizations, and end users.

First, software bugs can affect the time for release of the software product. This means the development time would be longer than stipulated because of bug fixing and the need to find these bugs and make the corrections.

Identifying software bugs is indeed time-consuming. This increases development costs, making the whole development process more expensive.

Software bugs can be annoying. You do not want to interact with an application user interface that is lagging or taking time to fetch data.

Finally, Software bugs raise concerns about regulatory compliance violations. A business can seen violating the applicable regulatory standard because of the bugs.

Bug Tracking and Reporting in the Software Development Process 


Launching a software product is not easy, with a need to ensure every feature is working properly and to the expected standards. To achieve this, it is necessary to conduct thorough testing to resolve bugs and asses real user conditions using bug tracking tools. This helps to catch underlying software bugs and resolve them before they are released to the market.

Testing processes require effective devices that allow testers to test the software across different browsers and operating systems. In this case, it is necessary for a tester to utilize cloud-based testing platforms like BrowserStack because of their infrastructure, which enables comprehensive testing across multiple modules. This allows testing in diverse environments or operating systems like Android, macOS, Windows, and iOS.

Tools like Gitlab Issues, Jira, and Userback can help track and report bugs in software and make the testing processes easier. They ensure the identification and resolution of software errors and defects. By systematically recording and fixing bugs, your development processes become more streamlined, fostering a more reliable software release that meets the needs of the end user.


The Role of the Testing Team in the Software Development Life Cycle

Software testing is a critical step in software development. The process involves assessing whether the software product is working as desired. The primary goal is to inspect the software product and document to determine whether the functionalities are being met, measuring the quality, finding errors, and preventing more problems.  Also, bug identification and prevention, reducing development costs, and enhancing performance are among the benefits of testing.

Retaining customer satisfaction is a difficult task, and the best way to ease off the pressure is to include bugs in software testing too. This aids in fixing any underlying problems to improve performance and functionality.

It is important for the company to be fully assured they can trust their products. This guarantees that they can get more sales. In this case, the goal is to employ different software techniques to ensure the final software product has all the required features and is fully functioning.


Software bugs can have serious effects on your software, affecting its intended purpose. It is important to be aware of common types of software bugs in testing to have a sense of direction on how to solve them. Regular testing to fix bugs will save you from losing your end users and the costs of fixing the problems after deployment.

With that in mind, you can transform your testing by signing up for our courses and enhancing your testing processes.

If you have any questions or comments, feel free to leave them in the comments section below.

Thanks for reading, and we look forward to seeing you in the next post!

Frequently Asked Questions

An example of a bug is a code error that may affect user experience. It may lead to a webpage lagging or not loading properly, causing frustration.

A software bug is any unexpected outcome or behavior, while a defect is a specific issue in a software design or code.

Three main types of bugs in programming are logical errors, syntax errors, and runtime errors. Logic errors involve flawed program workflows or codes, leading to incorrect results or outputs. Syntax errors occur due to code rule violations. Runtime errors occur during code execution, leading to unexpected results. 

A bug is a flaw in a software program that causes unexpected behaviors, while an issue is a broader term that refers to any concern related to software.

In software testing, a bug is an unexpected flaw in software or a program that causes it not to function correctly. Remember, bugs can manifest as crashes, errors, or unexpected behaviors.

A bug encompasses any unexpected behavior or issue in the code, while an error is a mistake in a code that affects its execution process.

Major and critical bugs represent severity in software testing. A major bug can affect the functionality of the software, but it can “kill” it completely, while a critical bug is more severe, causing serious damage and making the software unusable. 

A critical defect in the software could be a security compromise that allows unauthorized access to sensitive data. For example, a flow in the system can facilitate an SQL injection attack, posing a security risk to the software.  


Common types of bugs in software testing include logical errors (flaws of a program that lead to incorrect results), run time errors( issues that occur during program execution), and syntax errors(mismatches in coding). Also, performance bugs and security bugs affect different aspects of software features.

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