Reducing school class sizes in an attempt to raise pupil achievement is a waste of money for all but the youngest children, according to one of the country's leading teacher-educators.
Cutting class size by 30 per cent gives children the equivalent of four extra months of learning per year but costs around £20,000 per class per year, says Professor Dylan Wiliam, deputy director of the Institute of Education, London.
By contrast, he calculates that "formative assessment", a tried-and-tested approach to assessing and responding to children's learning needs, can provide eight extra months of educational development for only £2,000 per classroom per year. "It can therefore be 20 times as cost-effective as reducing class size in terms of pupil achievement,” he told the annual Chartered London Teachers Conference today.
“Smaller classes do confer a benefit if pupils are unruly, because fewer pupils in a class means less disruption. But as long as pupils are well-behaved, then what you can do with a class of 20 is generally possible with a class of 30. Smaller classes can also be more cost-effective for five to seven-year-olds, but research suggests the class size needs to be reduced to 15 or less."
Professor Wiliam says that investments in ICT have also shown a poor return. However, international studies have confirmed that formative assessment can double the speed of pupil learning.
Teachers adopting this approach are expected to monitor their pupils' progress continuously and provide appropriate feedback. Some teachers use a "traffic lights" system and ask pupils to hold up different coloured cards to show whether they have understood what they have been told. Red means "no", amber means "partly", and green "yes". Pupils are also encouraged to evaluate their own work and advise their classmates on how they can improve.
The English, Welsh, Scottish and Northern Irish education departments have all provided varying degrees of backing for formative assessment. But following three years of research in both the UK and the United States, Professor Wiliam has concluded that the approach will only take off properly if teachers work together in school-based groups to refine their classroom methods.
Having studied various types of “teacher learning communities” Professor Wiliam and his co-researchers have found that groups of 8 to 10 teachers who meet once a month for at least two years can be most effective. "It takes time to change teachers' ways of working, particularly if they have been in the classroom for many years," says Professor Wiliam. "Simply telling teachers what to do doesn't work.
"For example, most teachers have heard about research from the 1980s which shows that if they wait three to five seconds after asking a question their pupils' performance improves because they have been given some time to think. Even so, many teachers are still allowing less than a second for pupils to respond. The conclusion we can draw from that is that knowing what to do is the easy part of teaching. Actually doing it is what's hard."
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