Functional Safety Assessment (FSA)
ISO 26262-2: Independent Assessment Process & Methodology
What You'll Learn
Build complete competency in functional safety assessment (fsa) through structured, progressive learning.
Plan an ISO 26262-Compliant FSA
Define FSA scope, select assessment objects for each lifecycle phase, establish evidence requirements, and schedule sessions with appropriate assessor independence.
Select Qualified Assessors
Evaluate assessor competency against domain expertise, ISO 26262 knowledge, and independence criteria - and justify the selection in the safety plan.
Execute Structured Assessment Sessions
Conduct FSA interviews, evidence reviews, and confirmation measure witness sessions with consistent criteria and documented rationale for each assessment judgement.
Assemble the Evidence Package
Compile lifecycle-phase work products, traceability matrices, and confirmation measure records into a coherent, assessor-ready evidence package.
Manage Findings to Closure
Classify FSA findings, define root causes, implement corrective actions, and obtain assessor confirmation before closing each finding.
Write the Final Assessment Report
Produce a structured FSA report with assessment decision rationale - acceptable, conditionally acceptable, or not acceptable - with supporting evidence references.
12 Comprehensive Chapters
Each chapter builds your functional safety assessment (fsa) expertise systematically from foundations to advanced application.
FSA Overview
Position the Functional Safety Assessment as the highest-level confirmation measure in ISO 26262. Understand when it is mandatory (ASIL B-D with I2/I3 independence), its relationship to audits and reviews, and its role in the safety evidence chain.
ISO 26262-2 Requirements
Navigate ISO 26262-2 Clause 6 and Clause 5.4.7 FSA requirements: assessor independence levels by ASIL, timing relative to lifecycle phases, required assessment scope, and mandatory content of the FSA report.
Assessment Planning
Develop an FSA plan: define assessment scope and objectives, select assessment objects and lifecycle phases, schedule assessment sessions, identify evidence requirements, agree on interaction protocols with the development organization.
Assessor Qualifications
Define required assessor competencies: technical expertise in assessed domains, ISO 26262 knowledge, independence from the development organization, and professional experience thresholds. Covers team FSA with multiple specialists.
Assessment Across Lifecycle Phases
Tailor assessment scope to lifecycle phases: concept-phase FSA covers HARA, FSC, and safety plan; system FSA covers TSC, FMEA, FTA, and DIA; hardware FSA covers FMEDA and hardware metrics; software FSA covers SW plans, DV results, and code review.
Assessment Execution Methodology
Execute the FSA with structured interview techniques, document reviews, objective evidence sampling, and witness of confirmation measures. Apply consistent assessment criteria and document rationale for every judgement made.
Evidence Package Assembly
Define what constitutes a complete FSA evidence package: work products per lifecycle phase, confirmation measure records, safety case arguments, and traceability matrices - and how the package is presented to the assessor.
Common Non-Conformities
Catalog the most common FSA non-conformities found in practice: missing HARA traceability, inadequate independence evidence, incomplete FMEDA, undefined safe states, and absent corrective action records for previous findings.
Corrective Action Tracking
Manage FSA findings through a structured corrective action process: finding classification (observation/minor/major/critical), root cause analysis, corrective action definition, implementation, and assessor re-evaluation before closure.
Final Assessment Report
Structure the FSA final report: executive summary, assessment objectives, scope, assessment methodology, findings summary, corrective actions, and the final assessment decision (acceptable / conditionally acceptable / not acceptable).
Assessment vs. Audit
Distinguish FSA from functional safety audit by purpose, scope, examiner independence, decision authority, and evidence focus. Understand when each is appropriate and when both are required by ISO 26262.
Best Practices
Apply best practices for efficient and effective FSAs: early assessor engagement, living evidence packages, continuous finding tracking, pre-assessment readiness reviews, and post-FSA lessons-learned integration into future safety plans.
6 6 Interactive Diagrams & Tools
Experiment with visual tools that bring functional safety assessment (fsa) concepts to life.
FSA Lifecycle Integration Map
Visual overlay of FSA timing on the ISO 26262 V-model, showing when FSAs are triggered, which lifecycle artifacts are assessed at each phase, and how findings feed back into development.
Evidence Package Structure
Interactive evidence package diagram showing work product categories, traceability requirements, and completeness indicators for concept, system, hardware, and software lifecycle phases.
Finding Severity Classifier
Interactive tool for classifying FSA findings by impact and frequency: observation → minor → major → critical, with recommended response timelines and re-assessment triggers.
Assessor Independence Checker
Decision flowchart to verify assessor independence for a given ASIL level: organizational separation, financial independence, technical separation, and documentation required for the independence declaration.
Assessment Phase Timeline
Gantt-style timeline showing FSA planning, document review, site visits, findings management, and final report delivery with typical durations for ASIL C and D assessments.
Corrective Action Tracking Board
Kanban-style board visualization of FSA findings moving through Open → Corrective Action Defined → Implemented → Evidence Submitted → Closed states with assessor re-evaluation gates.
ASIL D Brake-by-Wire System FSA
End-to-end FSA for an ASIL D brake-by-wire system: concept-phase pre-assessment of HARA and FSC, system-phase assessment of TSC and FMEA, hardware-phase FMEDA review, and final pre-SOP FSA with conditional acceptance.
- Phase 1 FSA: HARA completeness - 2 major findings (missing operational situations)
- Phase 2 FSA: TSC-safety goal traceability - gap found in 4 of 23 requirements
- Phase 3 FSA: FMEDA - DC calculation error found, recalculation confirmed ASIL D compliance
- Final FSA: overall assessment - conditionally acceptable with 3 open points
- Open point 1: updated safety plan delivered within 2 weeks, accepted by assessor
- Final sign-off: 5 weeks before SOP - all conditions met and documented
BbW FSA Timeline
Master the Functional Safety Assessment Process
Whether you are preparing to be assessed or conducting an FSA yourself, build the knowledge to navigate every phase of this critical ISO 26262 activity.
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