Good software architecture documentation helps development teams make the right decisions for the right reasons. It also helps new team members understand the system, whether they are human or AI.
Yet many teams struggle to write documentation that stays useful. It becomes too long, misses key details, falls out of date, or never gets written at all. Now that AI agents are generating and changing code, the cost of missing or unclear documentation is higher than ever.

arc42 is a proven template with 12 chapters that brings structure to architecture documentation without turning it into bureaucracy. In this session, we will go through each chapter, explaining its purpose, what to include, and what to leave out, based on practical experience from real projects.

After this session, you will be able to jump-start the architecture documentation for your own project.