The 5 most common errors in software development

Why do so many software projects fail? The answer often lies in recurring errors that would be avoidable.

In our work with hundreds of projects, we have identified five errors that repeatedly lead to failure. Learn from the mistakes of others – it is cheaper than learning from your own.

1. Unclear or constantly changing requirements

Short: Executive answer: Avoid the 5 most common errors in software development.

Executive answer: Avoid the 5 most common errors in software development.

When planning The 5 most common errors in software development from idea to delivery, Cost Calculator: AI Development, Our Development Process, Software Maintenance sowie Cost Calculator: Software Development offer practical next steps on our site.

The problem

Short: The project starts without a clear vision.

The project starts without a clear vision. Requirements are constantly changed, extended or completely thrown over during development.

The team is chasing a moving target, and no one is satisfied at the end.

The solution Invest time in a thorough request analysis before starting. Define a minimum Viable Product (MVP) and hold it. Changes are allowed, but only through a structured change request process.

2. Underestimation of complexity and effort

The problem

Short: "This is just a simple app" – this set has already driven countless projects into ruin.

"This is just a simple app" – this set has already driven countless projects into ruin. Software is almost always more complex than thought, and optimistic estimates lead to unrealistic expectations.

The solution Multiply your first estimate with factor 2-3. Plan buffers for unforeseen. Break down the project into small, manageable units and estimate them individually.

3. Reliability of tests and quality assurance

The problem

Short: Tests are first deleted under time pressure.

Tests are first deleted under time pressure. "We test later" becomes a mantra – but later never comes. The result: A fragile software full of bugs that collapses during any change.

False "Testing only takes time. We'll end it."

Right "Test is part of development, not optional."

4. Missing or inadequate communication

The problem

Short: Developers, designers, product owners and stakeholders work in Silos.

Developers, designers, product owners and stakeholders work in Silos. Everyone has another understanding of what to build. Misunderstandings are only discovered late when the correction is expensive.

The solution Establish regular communication rituals: Daily Standups, Sprint Reviews, Retrospectives. Use visual tools such as prototypes and Wireframes to ensure that everyone understands the same.

5. Ignoring technical debt

The problem

Short: Short-term abbreviations and "Quick Fixes" accumulate.

Short-term abbreviations and "Quick Fixes" accumulate.

The code base is becoming more and more difficult to maintain, the speed of development drops, and at some point the project is hardly to be saved.

The solution Reserve 20% of each sprint for the reduction of technical debt.

Enter code reviews.

Measure the code quality with automated tools.

More in our article on [technical debt](/en/blog/software-development/avoid-technical-debt-a-guide-to-preventive-measures debt-avoiding-one-guide-fuer-praeventive measures).

"The most expensive bug is that one finds too late. Invest in prevention, not in repair."

Conclusion: Prevention is cheaper than rescue

All these errors are v

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Transparency: Where no primary source is named in the text, figures are illustrative; compare Bitkom and Destatis. Project-related statements: Groenewold IT, 2026.

References and further reading

Short: The following independent references complement the topics in this article:

The following independent references complement the topics in this article:

• Bitkom – German digital industry association
• German Federal Office for Information Security (BSI)
• European Commission – Digital strategy
• MDN Web Docs (Mozilla)
• W3C – World Wide Web Consortium

"Cloud-native only pays off when operations, security, and cost model match the architecture—otherwise you ship complexity faster."

— Björn Groenewold, Managing Director, Groenewold IT Solutions

Frequently Asked Questions (FAQ)

What is this article about: “The 5 most common errors in software development”?

This post explores The 5 most common errors in software development from the perspective of requirements, typical pitfalls, and sensible next steps.

In short: Avoid the 5 most common errors in software development. Learn from the mistakes of others and lead your project to success.

Who benefits most from the content described here?

Useful for project leads and product owners in Software maintenance who must choose between standard software, custom development, and integration.

How does this topic fit into an IT or digital strategy?

Technically and organizationally, alignment with experienced partners pays off — from requirements to operations; start with the [services overview](/en/services/artificial-intelligence). For multi-system landscapes, [IT consulting and architecture](/en/services/it-consulting) helps align vendors and internal teams.

What are sensible next steps if we need support?

A practical next step: book a consultation and clarify which MVP or pilot fits your team and landscape.