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Why Does Software Have Bugs?

Posted on March 19, 2023

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One of the most prominent questions that almost all the Software Testers out there have in their mind is “Why does software have bugs?” and “How will these bugs occur?”. This tutorial aims at answering these questions in simple terms.

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In this tutorial, we will explore the top 20 reasons on “why Bugs occur in the Software”. 

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What is a Software Bug?

A Software Bug is a failure or flaw in a program that produces undesired or incorrect results. It’s an error that prevents the application from functioning as it should.

Software Have Bugs

What You Will Learn:

  • Why Does Software Have Bugs?
    • Top 20 Reasons for Software Bugs
      • #1) Miscommunication or No Communication
      • #2) Software Complexity
      • #3) Programming Errors
      • #4) Changing Requirements
      • #5) Time Pressures
      • #6) Egotistical or Overconfident People
      • #7) Poorly Documented C
      • #8) Software Development Tools
      • #9) Obsolete Automation Scripts
      • #10) Lack of Skilled Testers
  • Conclusion

Why Does Software Have Bugs?

There are many reasons for the occurrence of Software Bugs. The most common reason is human mistakes in software design and coding.

Once you get to know the causes for Software Defects, then it will be easier for you to take corrective actions to minimize these defects.

software bugs

Top 20 Reasons for Software Bugs

#1) Miscommunication or No Communication

The success of any software application depends on the communication between stakeholders, development, and testing teams. Unclear requirements and misinterpretation of requirements are the two major factors that cause defects in software.

Also, defects are introduced in the development stage if the exact requirements are not communicated properly to the development teams.

#2) Software Complexity

The complexity of the current software applications can be difficult for anyone with no experience in modern-day software development.

Windows-type interfaces, Client-Server, and Distributed Applications, Data Communications, enormous relational databases, and sheer size of applications have all contributed to the exponential growth in software/system complexity.

Using object-oriented techniques can complicate, instead of simplifying, a project unless it is well-engineered.

#3) Programming Errors

Programmers, like anyone else, can make common programming mistakes. Not all developers are domain experts. Inexperienced programmers or programmers without proper domain knowledge can introduce simple mistakes while coding.

Lack of simple coding practices, unit testing, debugging are some of the common reasons for these issues to get introduced at the development stage.

#4) Changing Requirements

The customer may not understand the effects of changes or may understand and anyway request them to redesign, rescheduling of engineers, effects on the other projects, and the work already completed may have to be redone or thrown out, hardware requirements that may be affected, etc.

If there are any minor changes or major changes, known and unknown dependencies, then the parts of the project are likely to interact and cause problems, and the complexity of keeping a track of changes may result in errors. The enthusiasm of engineering staff may be affected.

In some fast-changing business environments, continuously changed requirements may be a fact of life.

In these cases, the management must understand the resulting risks, and QA & test engineers must adapt and plan for continuous extensive testing to keep the inevitable bugs from running out of control.

#5) Time Pressures

Scheduling software projects is difficult, often requiring a lot of guesswork. When deadlines loom and the crunch comes, mistakes will be made still.

Unrealistic schedules, though not common, the major concern in small-scale projects/companies results in software bugs. If there is not enough time for proper design, coding, and testing, then it’s quite obvious for defects to be introduced.

#6) Egotistical or Overconfident People

People prefer to say things like:

  • ‘no problem’
  • ‘piece of cake’
  • ‘I can whip that out in a few hours’
  • ‘It should be easy to update that old code’

Instead of:

  • ‘That adds a lot of complexity and we could end up making a lot of mistakes’.
  • ‘We do not know if we can do that; we’ll wing it’.
  • ‘I can’t estimate how long it will take until I take a closer look at it’.
  • ‘We can’t figure out what that old spaghetti code did in the first place’.
  • If there are too many unrealistic ‘no problem’s’, then it results in software bugs.

#7) Poorly Documented C

It’s tough to maintain and modify the code that is badly written or poorly documented; the result is Software Bugs. In many organizations, management provides no incentive for programmers to document their code or write clear, understandable code.

In fact, it’s usually the opposite: they get points mostly for quickly turning out code, and there’s job security if nobody else can understand it (‘if it was hard to write, it should be hard to read’).

Any new programmer working on this code may get confused because of the complexity of the project and the poorly documented code. Many times it takes a longer time to make even slight changes in poorly documented code, as there is a huge learning curve before making any code change.

#8) Software Development Tools

Visual tools, class libraries, compilers, scripting tools, etc. often introduce their own bugs or are poorly documented, resulting in added bugs.

Continuously changing software tools are used by software programmers. Keeping pace with the different versions and their compatibility is a major ongoing issue.

=> Read more on Software Development Tools

#9) Obsolete Automation Scripts

Writing automation scripts takes a lot of time, especially for complex scenarios. If automation team’s record/write any test script but forget to update it over a period, then that test could become obsolete.

If the automation test is not validating the results properly, then it won’t be able to catch the defects.

#10) Lack of Skilled Testers

Having skilled testers with domain knowledge is extremely important for the success of any project. But appointing all experienced testers is not possible for all companies.

Domain knowledge and the tester’s ability to find defects can produce high-quality software. Compromise on any of this can result in buggy software.

Here are a few more reasons for Software Bugs. These reasons mostly apply for Software Testing Life Cycle:  

#11) Not having a proper test setup (test environment) for testing all requirements.

#12) Writing code or test cases without understanding the requirements clearly.

#13) The incorrect design leads to issues being carried out in all phases of the Software Development Cycle.

#14) Releasing software patches frequently without completing the Software Testing Life Cycle.

#15) Not providing training to resources for the skills required for developing or testing the application properly.

#16) Giving very little or no time for Regression Testing.

#17) Not Automating Repetitive Test Cases and depending on the testers for manual verification every time.

#18) Not prioritizing test execution.

#19) Not tracking the development and test execution progress continuously. Last-minute changes are likely to introduce errors.

#20) Any wrong assumption made during coding and testing stages.

Conclusion

There are several reasons for the occurrence of software bugs. A list of the top 20 reasons was mentioned in this tutorial with a simple explanation.

Do you think we have missed any reason on the above list? Please share your thoughts in the comments section below.

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