What are Architecture Decision Records (ADRs)? Architecture Decision Records (ADRs) are the documents used to record the reasoning behind certain design decisions in projects for future reference. ADRs help understand the current state of the application’s architecture and infrastructure choices, facilitating future design decisions. ADRs are typically created in the markdown format and maintained in the version control like the rest of the application codebase. ADRs can be hosted in the application’s wiki section, making it accessible to business stakeholders.