The Software Development Life Cycle is not a theory. It is the operational map that defines how software is planned, built, tested, deployed, and maintained. When things break, recalling the SDLC means retracing every stage without error.
Start with requirements. Who defined them? Were they clear, testable, complete? Next, design. Was the architecture reviewed? Did you account for scalability, security, performance? In coding, inspect commit history, pull requests, code reviews. See what was missed.
Testing is where most recalls surface. Automated, unit, integration, regression—if any were skipped or rushed, the fault could hide here. Deployment, too: rollbacks should be built in, with canary releases or blue-green strategies ready to ship instantly.