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| Criterion |  Operations 5 Whys |  Architecture SAAM (Software Architecture Analysis Method) |  Operations Change Analysis |  Operations Root Cause Tree Analysis |
|---|---|---|---|---|
Purposedifferent | For a single, hard-to-explain deviation, the method exposes the causal chain behind the visible symptom. It keeps the cause open until a controllable condition emerges instead of a mere description. | SAAM helps teams judge an architecture’s suitability for selected tasks and changes. It is particularly useful for examining modifiability and comparing architecture alternatives with clear reasoning. | For a deviation after a change, the method isolates the influence of the altered condition. It narrows down which differences are relevant and which are just accompanying noise. | For a problem with several suspected causes, the method builds a causal structure instead of a mere list. It makes visible how causes connect and where the strongest points of leverage lie. |
Complexitydifferent | Low | High | Medium | Medium |
Timedifferent | 15-30 min | Preparation, scenario analysis, and findings review; effort depends on scope | 45-120 min | 1-3 h |
Participantsdifferent | 2-6 | Architecture experts and stakeholders for scenarios and weighting | 2-6 | 2-8 |
Formatdifferent | Workshop | Workshop + async | Workshop + async | Workshop |
Outputdifferent | Root cause notes, Countermeasures | Domain functions mapped to components and connections, Quality attributes and evaluation criteria, Typical tasks and their effects on the architecture, Reasoned evaluation or comparison of alternatives | Change Matrix, Cause Hypotheses, Validation Questions, Action List | Cause Tree, Evidence Notes, Countermeasures |
Tagsno overlap | Root causeIncidentLeanProblem solving | ArchitectureChangeAnalysisComparisonQuality | ChangeRoot causeTroubleshootingComparison | Root causeTreeIncidentQuality |