Details of a new 'O-level-style' examination regime to replace GCSEs will be announced this afternoon in the biggest overhaul of secondary school testing for a generation.

Education Secretary Michael Gove and Deputy Prime Minister Nick Clegg will launch the reforms jointly later today.

The changes are designed to introduce 'more academic rigour' to exams for 15 and 16-year-olds amid accusations of falling standards and dumbing down since the introduction of GCSEs in the late 1980s.

It will mean an end to modular and rolling assessments and a stronger emphasis on a single, final exam at the end of two years of study.

There will also be a limit to the proportion of top grades awarded in response to years of ever-rising numbers of As and A*s.

But what do you think? Do you welcome the reforms as a much-needed return to tougher assessments? Or will they discriminate against youngsters who have been shown to learn in a number of different ways?

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