Some children have objected to the "patronising" letters they receive from inspectors outlining Ofsted judgments about their schools, a report from the watchdog said today.
The majority of pupils thought the letters sent them after Ofsted visits were a good idea.
But younger children did not understand some of the language Ofsted used while some older pupils thought the tone of the letters was "patronising".
In its report on the impact of the letters, Ofsted said its inspectors needed more advice about "appropriate styles of writing for different ages".
Headteachers' leaders have fiercely criticised the letters, warning that they could undermine the work of staff.
The Ofsted research, which included research in 55 schools and a survey of more than 1,500 pupils, found nearly seven out of ten heads were "very pleased" with the letters.
The report says: "A very few secondary school councils felt that the tone of their letter was patronising, but almost all expressed a positive view.
"There were a number of common concerns regarding the content of the letters.
"The language of the primary school letters tended to be pitched towards the older or more articulate pupils.
"Although jargon was unusual, the meaning of some words and phrases such as 'monitoring' and 'teachers with management responsibilities' was lost on some of the younger pupils.
"Some pupils were confused by the mix of formal and informal styles. Due to the formal layout and absence of colour, they were unattractive to younger pupils."