Questions about the Reliability poster

What’s on the Reliability poster?

A definition and 6 facts worth remembering. Reliability is the consistency of a measurement. Every score is the true score plus error, and the error is larger than most reporting admits. Longer tests are more reliable than short ones.; Reliability sets a ceiling on validity.; Test-retest, internal and inter-rater forms differ.; Single questions are very unreliable.; Small score differences are usually noise.; A reliable test can still measure the wrong thing.; Reported as — 0 to 1; Common target — 0.8 and above; A pupil scoring 62 on a test with a standard error of 4 marks could plausibly have sc…. Educational reference. Grade boundaries fall inside the error band, so a proportion of grades near any boundary are effectively arbitrary.

Who is the Reliability poster for?

Reliability belongs to the Education section rather than to a school year, because humanities is not something one grade owns. Anyone learning assessment can pin it up — a beginner, a student mid-course, or someone revising years later.

When should you use the Reliability poster?

Use it before treating a two-mark difference as evidence of anything. A wall chart earns its place by being glanceable from where the work is happening, so Reliability belongs on the wall where that humanities work actually happens, within glancing distance, rather than filed away.

What other posters go with Reliability?

Comparative Judgement, Reading A Test Score and Blueprinting A Test sit alongside Reliability in the Education section. Printed together they make a wall rather than a single sheet, which is how a reference set actually gets used.Comparative JudgementReading A Test ScoreBlueprinting A Test

Is the Reliability poster free to download and print?

Yes. Reliability downloads as a free PDF with no account, no email and no watermark, like everything else in the Education section. Print as many copies as you like for a home, a classroom, a library or a tutoring group; reselling the file is the only thing the licence rules out.Read the licence

What size does the Reliability poster print at?

Reliability is a vector PDF laid out for US Letter, and prints on A4 with Fit to page — the same file, no separate download. Because every mark on it is drawn rather than photographed, it stays sharp enlarged to A3, A2 or A1 at a copy shop. Colour carries emphasis only, so a greyscale print of Reliability loses nothing.Printing guide