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Selected:Blameless Postmortem Learning Review ARID (Active Reviews for Intermediate Designs)4Ls Retrospective

Criterion	DevOps Blameless Postmortem	Operations Learning Review	Architecture ARID (Active Reviews for Intermediate Designs)	Agile 4Ls Retrospective
Purposedifferent	After an incident with damage or a near miss, the method creates a sober field for learning without assigning blame. It directs attention to the course of events, conditions, and effective countermeasures.	After a project phase with mixed results, the method makes learning from the individual case reusable. It connects events, decisions, and systemic conditions into robust insights.	ARID examines how well developers can work with a technical design. It focuses on a part of the system that can still be revised, between the architecture overview and the detailed specification.	When a sprint should not only be assessed but also learned from, it captures experience in clear learning categories. It records what worked, what's missing, and what should run differently next time.
Complexitydifferent	Medium	Medium	Medium	Low
Timedifferent	30-90 min	1-3 h	2–4 h review as a planning range; preparation and evaluation additional	45–75 min
Participantsdifferent	3-12	3-10	Designers, developers as users, and facilitation	Team members involved
Formatdifferent	Workshop + async	Workshop	Workshop + async	Workshop
Outputdifferent	Postmortem Doc, Action Items, Timeline	Learning Review Notes, System Factors, Improvement Actions	Prioritized development tasks, Jointly produced code or pseudocode, Observed difficulties and open design questions, Proposed design revisions	4Ls Board, Learning Themes, Improvement Actions
Tagsno overlap	Site Reliability EngineeringIncidentLearningReliability	LearningRetrospectiveIncidentOperations	ArchitectureEngineeringFeedbackValidationTasks	RetrospectiveLearningReflectionTeam

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