FSOE Written Test study plan

Define PFDavg, PFH, architectural constraints, Safe Failure Fraction and hardware fault tolerance from memory, then verify each definition against the standard text and correct your notes

Compute PFDavg for a 1oo1, 1oo2 and 2oo3 voting group using simplified formulas for a given demand rate and proof-test interval, showing every intermediate step

Classify at least 10 component failure modes as safe, dangerous detected or dangerous undetected, and justify each classification in one sentence

Build a one-page decision table that maps SIL target, architecture and SFF to the required HFT for each subsystem type

Derive the relationship between proof-test interval, diagnostic coverage and achieved PFDavg, and quantify how halving the interval changes the result

Explain systematic capability, systematic failure and common-cause failure, and list at least six beta-factor contributors for a redundant channel pair

Solve five SIL verification scenarios where an initial design fails its target and propose concrete design changes that close the gap

Summarise the differences in SIL allocation approaches (risk graph, risk matrix, layer of protection analysis, ALARP-based) and state when each is appropriate

Map the software safety lifecycle phases and their required inputs and outputs onto a real project you know, noting where your past projects skipped steps

Write a software safety requirements specification for one interlock function, including integrity, timing, response and fault-reaction requirements

Compare diverse monitoring, watchdog, memory protection and defensive programming techniques, and select a justified technique set for SIL 2 and SIL 3

Design a verification strategy that covers static analysis, unit testing, integration testing and requirement-based coverage, and state the entry and exit criteria for each

Build a HAZOP-style worksheet for a small process or machine subsystem, generating at least 15 credible deviations with causes, consequences and safeguards

Perform a layer-of-protection analysis that assigns independent protection layers and derives the required risk reduction for one scenario

Convert hazard analysis outputs into a functional safety concept, allocating safety functions to subsystems and defining safe states

Write the safety requirements specification structure: scope, functional requirements, integrity requirements, and assumptions of use

Draft a functional safety management plan outline covering competence, independence, verification, configuration management and assessment

Distinguish the roles of assessor, validator, designer and project manager, and state the independence requirements for each SIL

Compare the scope and key differences of the main functional safety standards for process, machinery and generic applications, and note which standard governs which sector

List the evidence a certification body expects for a functional safety assessment and identify which items you could produce today

Produce an architecture description for a safety instrumented system showing sensor, logic solver and final element subsystems with their interfaces and diagnostics

Explain and apply the concepts of safe state, fault reaction time, process safety time and demand mode, and check a design against each

Plan validation activities: factory acceptance testing, site acceptance testing, proof-test design and validation of the achieved integrity

Identify at least eight systematic design weaknesses (interface mismatch, bypass handling, reset behaviour, diagnostic coverage gaps) and specify a mitigation for each

Write a proof-test procedure for a redundant sensor loop that detects dangerous undetected failures and states the required test coverage

Design a management-of-change workflow for a safety system modification, including impact analysis, re-verification triggers and approval authority

Describe the decommissioning lifecycle: isolation, removal of safety functions, documentation, and residual risk communication

Explain how to build and sustain safety culture: incident reporting, bypass registers, competence refresh and audit cadence

Answer 120 mixed practice questions under timed conditions and record your score by domain

Re-derive the five formulas or tables you got wrong most often until you can reproduce them without notes

Write one-paragraph answers to the ten most common scenario-style questions, each stating the standard reference and the practical action

Review your weakest two domains and close every gap flagged in your error log