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In the functional safety standards based on the IEC 61508 standard, four SILs are defined, with SIL4 being the most dependable and SIL1 the least. The applicable SIL is determined based on a number of quantitative factors in combination with qualitative factors, such as risk assessments and safety lifecycle management .
The Illinois Standards Achievement Test (ISAT) measured individual student achievement based on the Illinois Learning Standards. The results of this score were applied to the No Child Left Behind Act, to identify failing schools. The ISAT was retired as a state assessment tool.
An SIS performs a safety instrumented function (SIF). The SIS is credited with a certain measure of reliability depending on its safety integrity level (SIL). The required SIL is determined from a quantitative process hazard analysis (PHA), such as a Layers of Protection Analysis (LOPA). The SIL requirements are verified during the design ...
The self-imposed safety checks performed by Illinois manufacturers within their facilities are the first steps in a long process of quality control measures that an aircraft and its parts endure ...
Atomicity, consistency, isolation (sometimes integrity), durability is a transaction metric. When dealing with safety-critical systems, the acronym reliability, availability, maintainability and safety is frequently used. [citation needed] Dependability is an aggregate of availability, reliability, safety, integrity and maintainability.
IEC/EN 62061, ”Safety of machinery: Functional safety of electrical, electronic and programmable electronic control systems”, is the machinery specific implementation of IEC/EN 61508. It provides requirements that are applicable to the system level design of all types of machinery safety-related electrical control systems and also for the ...
D.Smith, K Simpson, "Safety Critical Systems Handbook: A Straightforward Guide to Functional Safety, IEC 61508 (2010 Edition) And Related Standards, Including Process IEC 61511 and Machinery IEC 62061 and ISO 13849" (3rd Edition ISBN 978-0-08-096781-3, Hardcover, 288 Pages).
The primary functional safety standards in current use are listed below: IEC EN 61508 Parts 1 to 7 is a core functional safety standard, applied widely to all types of safety critical E/E/PS and to systems with a safety function incorporating E/E/PS. UK Defence Standard 00-56 Issue 2; US RTCA DO-178C, North American Avionics Software