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

Criterion	Agile 4Ls Retrospective	DevOps Blameless Postmortem	Architecture ARID (Active Reviews for Intermediate Designs)	Operations Learning Review
Purposedifferent	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.	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.	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.	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.
Complexitydifferent	Low	Medium	Medium	Medium
Timedifferent	45–75 min	30-90 min	2–4 h review as a planning range; preparation and evaluation additional	1-3 h
Participantsdifferent	Team members involved	3-12	Designers, developers as users, and facilitation	3-10
Formatdifferent	Workshop	Workshop + async	Workshop + async	Workshop
Outputdifferent	4Ls Board, Learning Themes, Improvement Actions	Postmortem Doc, Action Items, Timeline	Prioritized development tasks, Jointly produced code or pseudocode, Observed difficulties and open design questions, Proposed design revisions	Learning Review Notes, System Factors, Improvement Actions
Tagsno overlap	RetrospectiveLearningReflectionTeam	Site Reliability EngineeringIncidentLearningReliability	ArchitectureEngineeringFeedbackValidationTasks	LearningRetrospectiveIncidentOperations

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