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Senior Quality & Automation Test Engineer
I break things...
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James Wadley
James Wadley
achieved:
This badge is awarded to members who contribute a new term or an alternative definition to the software testing glossary. image
This badge is awarded to members who contribute a new term or an alternative definition to the software testing glossary.
<a href="https://www.ministryoftesting.com/software-testing-glossary/heisenbug" rel="noopener nofollow">Heisenbug</a> image
Heisenbug
James Wadley
James Wadley
contributed:
<div>The term “Heisenbug” is a playful pun on the name of Werner Heisenberg, the well-known physicist who first asserted the observer effect of quantum mechanics.<br><br>
</div><div>“The observer effect (not to be confused with the uncertainty principle) is the fact that observing a situation or phenomenon necessarily changes it. Observer effects are especially prominent in physics where observation and uncertainty are fundamental aspects of modern quantum mechanics. Observer effects are well-known in fields other than physics, such as sociology, psychology, linguistics and computer science.” - The Observer Effect: IEEE publication, K. Baclawski et al. <br><br>
</div><div>An example would be checking your tyre pressure. By simply attaching a tyre gauge to the valve, you’re almost guaranteed to lose a very small amount of air. So simply by trying to read the tyre pressure, you’ll have changed the tyre pressure.<br><br>
</div><div>With this in mind, we can assume that the mere process of trying to reproduce a defect could change the behaviour of the code enough that the defect no longer occurs.<br><br>
</div> image
Definitions of Heisenbug
James Wadley
James Wadley
achieved:
This badge is awarded to members who complete the Introduction to Cypress course. image
This badge is awarded to members who complete the Introduction to Cypress course.
James Wadley
James Wadley
achieved:
This badge is awarded to members who update their profile with a new photo. image
This badge is awarded to members who update their profile with a new photo.
James Wadley
James Wadley
achieved:
This badge is awarded to members who visit the Ministry of Testing site 404 times image
This badge is awarded to members who visit the Ministry of Testing site 404 times
James Wadley
James Wadley
achieved:
This badge is awarded to members who visit the Ministry of Testing site 99 times image
This badge is awarded to members who visit the Ministry of Testing site 99 times
James Wadley
James Wadley
achieved:
This badge is awarded to members who have added 10 memes to the MoT platform image
This badge is awarded to members who have added 10 memes to the MoT platform
James Wadley
James Wadley
achieved:
This badge is awarded to members who update their social links on their profile. image
This badge is awarded to members who update their social links on their profile.
James Wadley
James Wadley
achieved:
This badge is awarded to members who publish their first article on the Ministry of Testing site image
This badge is awarded to members who publish their first article on the Ministry of Testing site
<a href="https://www.ministryoftesting.com/memories/stec-is-complete-19-modules-58-voices-and-jam-packed-portfolio-to-show-your-growth" rel="noopener nofollow">STEC is complete 🎉: 19 modules, 58 voices, and jam packed portfolio to show your growth</a> image
STEC is complete 🎉: 19 modules, 58 voices, and jam packed portfolio to show your growth
James Wadley
James Wadley
contributed:
Eighteen months, 19 modules, and 59 amazing contributors later, the MoT Software Testing Essentials Certification is complete!

Looking back, my favourite part has been seeing so many community m... image
Eighteen months, 19 modules, and 59 amazing contributors later, the MoT Software Testing Essentials Certification is complete! Looking back, my favourite part has been seeing so many community m...
<div>Thank you for going above and beyond in July 2025. Team MoT sees you and appreciates you, as does the community. Your positive impact and interactions make a difference.</div> image
Thank you for going above and beyond in July 2025. Team MoT sees you and appreciates you, as does the community. Your positive impact and interactions make a difference.
James Wadley
James Wadley
achieved:
This badge is awarded to members who Log in to MoT five days in a row. image
This badge is awarded to members who Log in to MoT five days in a row.
Realised from listening to this week in testing, being in various meetups and conferences this year - a handy wee tip. Hope it helps.
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Realised from listening to this week in testing, being in various meetups and conferences this year - a handy wee tip. Hope it helps.
<div>Thanks for showing up for TWiT!</div> image
Thanks for showing up for TWiT!
<div>Thanks for sharing awesome words about TestBash in the chat during <a href="https://www.ministryoftesting.com/podcasts/this-week-in-testing?wchannelid=czgwdadw2c&amp;wmediaid=0gfwwo1n94" rel="noopener nofollow">Episode 97 of This Week in Testing</a>. </div> image
Thanks for sharing awesome words about TestBash in the chat during Episode 97 of This Week in Testing. 
I had a wonderful chat with Gary Hawkes about his journey over the years with testing and now quality engineering and I absolutely love how it felt like his story was that all roads have led to qua... image
I had a wonderful chat with Gary Hawkes about his journey over the years with testing and now quality engineering and I absolutely love how it felt like his story was that all roads have led to qua...
James Wadley
James Wadley
awarded Sarah Deery for:
<div> Huge thanks to Sarah for bringing together all the certificate contributions. I was keen to be involved but had some anxiety around public speaking — Sarah made the whole process smooth and welcoming. Her thoughtful approach to the audio recordings made all the difference. </div> image
 Huge thanks to Sarah for bringing together all the certificate contributions. I was keen to be involved but had some anxiety around public speaking — Sarah made the whole process smooth and welcoming. Her thoughtful approach to the audio recordings made all the difference. 
James Wadley
James Wadley
awarded Danny Dainton for:
<div>The man, the legend! A well-known and much-appreciated presence in the community, Danny is always sharing the latest from Postman, jumping in to answer questions, and making time for chats. Approachable, engaged, and endlessly helpful, he's an all-round great guy. </div> image
The man, the legend! A well-known and much-appreciated presence in the community, Danny is always sharing the latest from Postman, jumping in to answer questions, and making time for chats. Approachable, engaged, and endlessly helpful, he's an all-round great guy. 
James Wadley
James Wadley
awarded Gary Shannon for:
<div>Gary is fast becoming a Legend of the MoT community. He has dedicated time and energy to creating such fantastic meetups for the testing community and is an all-round great guy. </div> image
Gary is fast becoming a Legend of the MoT community. He has dedicated time and energy to creating such fantastic meetups for the testing community and is an all-round great guy. 
James Wadley
James Wadley
awarded Stuart Thomas for:
<div>Stu reviewed my CV and provided some incredibly helpful feedback. Im really grateful for the time he gave.</div> image
Stu reviewed my CV and provided some incredibly helpful feedback. Im really grateful for the time he gave.
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