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Selected:5 WhysLASR (Lightweight Approach for Software Reviews)Root Cause Tree AnalysisFailure Mode and Effects Analysis
| Criterion |  Operations 5 Whys |  Architecture LASR (Lightweight Approach for Software Reviews) |  Operations Root Cause Tree Analysis |  Operations Failure Mode and Effects 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. | LASR helps development teams identify where their software falls short of important quality goals and which improvements to consider. A small group with existing system knowledge can make an initial assessment and investigate open questions in more detail. | 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. | For a process, product, or service with noticeable failure risks, the method assesses possible failure modes in advance. It directs attention to combinations of occurrence, effect, and detectability. |
Complexitydifferent | Low | Medium | Medium | High |
Timedifferent | 15-30 min | 3–4 h for initial assessment; preparation and deeper analysis additional | 1-3 h | 2-6 h |
Participantsdifferent | 2-6 | 1 or a small team; particularly suitable for 3–4 people | 2-8 | 3-10 |
Formatdifferent | Workshop | Workshop + async | Workshop | Workshop |
Outputdifferent | Root cause notes, Countermeasures | Lean Mission Statement describing the software’s purpose, Prioritized quality goals and evaluation criteria, Risks and estimated gaps against quality goals, More closely examined findings and open checks | Cause Tree, Evidence Notes, Countermeasures | FMEA Table, Risk Priority, Mitigation Actions |
Tagsno overlap | Root causeIncidentLeanProblem solving | ArchitectureQualityRiskAssessmentLean | Root causeTreeIncidentQuality | RiskQualityOperationsRoot cause |