A Systematic Workflow for Finding and Fixing Bugs
Available November 2026, 272 pp.
Nobody teaches you how to debug. You learn it the hard way, bug by bug, over years of trial and error. Johannes Kuhlmann spent those years shipping video games, where the bugs are brutal and the deadlines don't move, and turned what he learned into a workflow you can follow the next time something breaks: Reproduce, Probe, Examine, Fix.
Each phase of the workflow comes with numbered, battle-tested strategies you can apply in any language and at any level of the stack, from a misbehaving UI to a race condition that only appears in production. Worked examples drawn from real shipped software show each strategy in action, including the failures and dead ends that are part of every honest debugging session. You'll learn how to:
- Reproduce intermittent bugs quickly and reliably, because a bug you can't reproduce is a bug you can't fix
- Write bug reports that shorten the path to a fix instead of starting an argument
- Narrow thousands of lines of suspect code down to the failure point
- Confirm the actual root cause before you change anything, so the bug stays fixed
Author Bio
Johannes Kuhlmann is the Studio Technical Director at Fishlabs and has over 15 years of experience as a programmer and technical lead. Kuhlmann has worked on a wide range of video games, including Chorus, Goat Simulator 3, Valheim, and titles from the Saints Row and LittleBigPlanet franchises. He holds a Diplom in Computer Science from the University of Hamburg. Having learned debugging by trial and error, he’s prevented innumerable bugs from reaching users.