First Out

Courses, universities and certification training

Teach SIL work with a tool that shows its working

Students learn more from a calculation they can open up than from a number. Every First Out AI result shows the method, the intermediate terms and the engineer's reading, and the free plan needs no account, so a class can start in minutes.

Ask about classroom and partner termsFree calculators
1 · LearnKnowledge librarymethods with worked numbers 2 · PractiseFree calculatorsformulas on the page 3 · ApplyFirst Out AIa whole function, three checks 4 · CheckWorked examplescompare with a known answer
A course module built from First Out material: theory, a single calculation, a whole function, then a check against a worked answer.

  • For students

    Free, without an account: the SIL verification for 1oo1, 1oo2 and 2oo3, the four free calculators, all worked examples, the knowledge library and the six-question self-test. A free account adds ten AI questions a month.

  • For instructors

    Set exercises on the free calculators and ask students to verify by hand with the equations on the page. Use the worked examples as reference answers. Link to the knowledge articles as reading; please credit First Out and link the source page.

  • For training providers

    Classroom licences give every participant the paid features for the length of a course, with the AI assistant for questions between sessions. Training providers who recommend First Out AI can ask about partner terms.

Ready-made exercises

Each one uses a free page, has a single right answer you can check, and teaches one point reviewers often find wrong.

ExercisePageThe point it teaches
Coverage versus intervalPFDavg calculatorHalve the proof test interval at 70 % coverage and see how little PFDavg falls: the untested share dominates.
Why 2oo2 is not saferPFDavg calculatorSame channels as 1oo2 and 2oo2: twice the PFDavg of 1oo1 for 2oo2, a fraction of it for 1oo2.
β decides the bandPFDavg calculatorA 1oo2 group at β 2 %, 5 % and 10 %: common cause, not redundancy, sets the result.
The unreachable targetInterval calculatorLower the coverage until no interval meets the target, then calculate the threshold by hand.
Double counting in LOPALOPA calculatorCredit the failed control loop as a layer too and see the required SIL drop by a band.
FIT or per million hoursFailure rate converterThe factor of 1,000 behind the most common unit error.

Running a course or a university module? Tell us the dates, the number of participants and what you teach.

Contact usKnowledge library