TMMI Level 5: How Mature Teams Stop Bugs Before They Exist - Zsolt Hargitai

What does it actually take to move from finding defects to preventing them? With Zsolt Hargitai I talk about TMMI, a framework for improving test processes, and why that shift in mindset marks the difference between a team that tests and a team that has genuinely matured. We get into what the maturity levels mean in practice, how a free self-assessment tool on the TMMI website gives you a first impression of where your organization stands, and why the framework holds up across agile, V-model, and DevOps environments alike. I was also curious about the human side: Zsolt mentions that companies implementing TMMI tend to see lower fluctuation rates because people feel more comfortable and satisfied, which is not the angle most managers expect when they start talking about process improvement.

"They are not focusing on finding the defects but more like preventing the defects." - Zsolt Hargitai

Zsolt Hargitai is a Test Manager, trainer, and test process improvement expert with extensive international experience across the banking, aviation, energy, logistics, and retail sectors. He applies ISTQB, IREB, and TMMi standards in a practical and results-oriented way, delivers testing trainings, regularly speaks at international conferences, and hosts professional podcasts focused on software testing. He serves as Vice President of the Hungarian Testing Board (HTB), Secretary of the TMMi Foundation, and Head of the TMMi Hungary Local Chapter, and is also a member of the ISTQB Marketing Working Group. Between 2002 and 2019, he worked at Lufthansa Systems. Since then, he has been the founder of the IT consulting companies DHX Ltd. and TesterLab.

Highlights:

• TMMI certifies companies at maturity levels two through five, with each level representing a distinct capability: from basic test planning, through team organization and metrics, to defect prevention.
• A company reaching level five shifts its primary focus from finding defects to preventing them from entering the process, which represents a fundamentally different quality mindset.
• TMMI applies across all software development lifecycles, including agile, V-model, and DevOps, so a team's development approach is not a barrier to adoption.
• The TMMI Foundation's free lightning scan tool lets any team self-assess their level two and level three maturity in minutes, without consultant involvement.
• Certifications expire and must be renewed, because the TMMI Foundation actively revises the model when the IT landscape changes significantly enough to affect its relevance.

📌 Testing is a people business, humanity as a superpower. That is my talk on October 7 at HUSTEF 2026 in Budapest: See programme and tickets