The structure of the survey is similar to that used previously. A field test takes place a year ahead of the main data collection, followed by analysis and reporting a year later. For TIMSS 2011 in England, the field test took place in spring 2010, the main data collection takes place in spring/summer 2011 and reports will be available in December 2012.

TIMSS sets high participation targets, in order to ensure that data is of good quality and that valid comparisons between countries can be made. In England, 150 randomly sampled schools for each age group are being invited to participate in TIMSS 2011.

In each age group, sampled pupils complete a single test booklet containing items assessing achievement in mathematics and science. The item formats vary and include closed-response items, short-answer items and more extended items focussing on problem-solving and investigatory approaches in mathematics and science.

Findings from TIMSS are detailed. They include:

• Achievement data, by subject and by content domain within each subject
• Achievement data by cognitive domain within each subject (knowing, applying, reasoning)
• Comparative data, showing each country's achievement against that of other countries, by subject and by content and cognitive domains
• Trend data, showing each country's achievement over time, by subject and by content and cognitive domains
• 'Benchmark' data, describing the achievements of pupils in different bands, and the proportion of pupils in each achievement band, for each country
• Contextual information, at country level, school level and pupil level
• Analysis of the interaction between contextual variables and achievement

International findings from TIMSS 2007 and previous cycles are available on the International Study Center website: http://isc.bc.edu.

The national report for England for TIMSS 2007 can be accessed here

The national report for England for TIMSS 2003 can be accessed here

The TIMSS 2007 national report for Scotland can be accessed at
http://www.scotland.gov.uk/Publications/2008/12/08150124

Participating schools are randomly selected by the international team which runs the survey. The international team also specifies which class(es) and pupils should participate. Participating countries are not allowed to invite other schools if the selected schools decline, and schools not drawn in the sample cannot opt to participate. This approach ensures that each country's sample is robust and comparable with that of other participating countries.

In England, 150 randomly sampled schools are being invited to participate in TIMSS 2011. We aim to make their participation as straightforward as possible. We are grateful to the schools, teachers and pupils who make time to represent England in this important study.