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Selected:Fault IsolationLASR (Lightweight Approach for Software Reviews)Root Cause AnalysisFailure Mode and Effects Analysis
| Criterion |  Engineering Fault Isolation |  Architecture LASR (Lightweight Approach for Software Reviews) |  Operations Root Cause Analysis |  Operations Failure Mode and Effects Analysis |
|---|---|---|---|---|
Purposedifferent | In technical failures, the visible symptom often gets mixed up with the actual cause. Fault Isolation narrows the fault space and progressively reduces which part of the system is truly affected. | 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. | When a problem keeps recurring and the cause stays unclear, the method exposes the underlying mechanism. It separates symptom, guess, and robust explanation from one another. | 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 | Medium | Medium | Medium | High |
Timedifferent | 30-180 min | 3–4 h for initial assessment; preparation and deeper analysis additional | 1-4 h | 2-6 h |
Participantsdifferent | 1-6 | 1 or a small team; particularly suitable for 3–4 people | 3-8 | 3-10 |
Formatdifferent | Workshop + async | Workshop + async | Workshop + async | Workshop |
Outputdifferent | Fault Isolation Map, Test Log, Excluded Hypotheses, Narrowed Fault Area | 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 | Problem Statement, Cause Hypotheses, Confirmed Causes, Action Plan | FMEA Table, Risk Priority, Mitigation Actions |
Tagsno overlap | TroubleshootingDiagnosisEngineering | ArchitectureQualityRiskAssessmentLean | Root causeProblem solvingQualityIncident | RiskQualityOperationsRoot cause |