Key Stage 4Key Stage 4 (KS4) is the legal term for the two years of school education which incorporate GCSEs, and other examinations, in maintained schools in England normally known as Year 10 and Year 11, when pupils are aged between 14 and 16 by August 31. (In some schools, KS4 work is started in Year 9.) The term is defined in the Education Act 2002 as "the period beginning at the same time as the school year in which the majority of pupils in his class attain the age of fifteen and ending at the same time as the school year in which the majority of pupils in his class cease to be of compulsory school age".
Key Stage 2Key Stage 2 is the legal term for the four years of schooling in maintained schools in England and Wales normally known as Year 3, Year 4, Year 5 and Year 6, when the pupils are aged between 7 and 11 years. The term is defined in the Education Act 2002 as the period beginning at the same time as the school year in which the majority of pupils in a class attain the age of eight and ending at the same time as the school year in which the majority of pupils in a class attain the age of eleven.
Key Stage 1Key Stage 1 is the legal term for the two years of schooling in maintained schools in England and Wales normally known as Year 1 and Year 2, when pupils are aged between 5 and 7. This Key Stage normally covers pupils during infant school, although in some cases this might form part of a first or primary school. It is also the label used for the third and fourth years of primary education in Northern Ireland. In Hong Kong, it is used to describe Primary One to Primary Three.
Key StageA key stage is a stage of the state education system in England, Northern Ireland and the British Overseas Territory of Gibraltar setting the educational knowledge expected of students at various ages. The term is also used in some other autonomous territories such as Hong Kong, and countries such as Australia (some states), although the ages at which each key stage applies differ between countries. Key Stages in England are often abbreviated as KS (ex. KS1).