Class SizeThe most studied question in education, and one of the most disappointing.EducationClass size reduction lowers the number of pupils per teacher.The effect on attainment is real but small, and expensive perunit of gain.TENNESSEE STARsmall, real gainsCOST PER GAINhighEffects appear mainly below about 20 pupils.Largest effects are in the earliest years.Small reductions produce very small effects.Teachers often do not change methods when classes shrink.Reduction requires hiring, which can lower average quality.The same money on teacher development often buys more.LOOK FOR ITCutting a class from 30 to 27 changes very little. Cutting it from 30 to 15changes something, at roughly double the staffing cost.Educational reference. The finding is robust and consistently unpopular:the effect is genuine, but the cost-effectiveness is poor.Class Sizelearnposters.com
Class Size — printable humanities wall chart from LearnPosters. Free vector PDF, US Letter and A4.

What’s on the Class Size poster

A definition and 6 facts worth remembering.

Class size reduction lowers the number of pupils per teacher. The effect on attainment is real but small, and expensive per unit of gain.

Educational reference. The finding is robust and consistently unpopular: the effect is genuine, but the cost-effectiveness is poor.

Questions about the Class Size poster

What’s on the Class Size poster?
A definition and 6 facts worth remembering. Class size reduction lowers the number of pupils per teacher. The effect on attainment is real but small, and expensive per unit of gain. Effects appear mainly below about 20 pupils.; Largest effects are in the earliest years.; Small reductions produce very small effects.; Teachers often do not change methods when classes shrink.; Reduction requires hiring, which can lower average quality.; The same money on teacher development often buys more.; Tennessee STAR — small, real gains; Cost per gain — high; Cutting a class from 30 to 27 changes very little. Cutting it from 30 to 15 changes s…. Educational reference. The finding is robust and consistently unpopular: the effect is genuine, but the cost-effectiveness is poor.
Who is the Class Size poster for?
Class Size belongs to the Education section rather than to a school year, because humanities is not something one grade owns. Anyone learning policy & systems can pin it up — a beginner, a student mid-course, or someone revising years later.
When should you use the Class Size poster?
Read it before a large reduction is funded in the expectation of large gains. A wall chart earns its place by being glanceable from where the work is happening, so Class Size belongs on the wall where that humanities work actually happens, within glancing distance, rather than filed away.
What other posters go with Class Size?
Accountability, Who Decides The Curriculum and Early Years Policy sit alongside Class Size in the Education section. Printed together they make a wall rather than a single sheet, which is how a reference set actually gets used.AccountabilityWho Decides The CurriculumEarly Years Policy
Is the Class Size poster free to download and print?
Yes. Class Size 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 Class Size poster print at?
Class Size 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 Class Size loses nothing.Printing guide

Related posters

Charts that sit alongside Class Size on the same wall.

Browse every Education poster, or start from the full catalogue.