The biggest shake-up of secondary schooling in England for decades has been proposed in a major report.
Mike Tomlinson has sought to build a consensus for his plans
GCSEs, A-levels and vocational qualifications should evolve over the next decade into a new diploma system, the Tomlinson report recommends.
But there are signs the proposals will not have a political consensus.
The Conservatives say they would go back to having a fixed quota of A-level students getting the top grade, and keep external exams at the age of 16.
Under the Tomlinson plans, there would be fewer exams but, at advanced level, tougher questions would stretch the brightest.
There would be clearer routes for those wanting more specialised, work-related learning within the diploma.
And everyone would have to have the "core" communication and numeracy skills businesses say children often lack.
Four-level diploma to be introduced as new qualification
A-level and GCSE courses would be components
Pupils learn at own pace, take exams when ready
Vocational options improved
Mandatory basic English and maths
Recognition for other experiences, such as voluntary work
Coursework replaced by a single big project
Changes gradual - taking perhaps a decade
The changes, taking up to 10 years to implement if adopted by the government, were recommended by the working party on 14 to 19 learning headed by Mike Tomlinson, former chief inspector of England's schools.
The advanced diploma exams would include extra questions to challenge those at higher ability levels.
These would offer new A+ and A++ grades on top of the present A grade.
But the Conservatives dropped something of a bombshell on Sunday by saying they would turn back the clock to the system that used to exist until the early 1980s.
This would mean only a fixed proportion of students, perhaps 5% or 10%, could get a top grade, however well the others did against an objective standard.
At intermediate level, roughly equivalent to the current GCSEs, the Tomlinson ideas are likely to involve a far greater reliance on internal assessment by teachers.
NEW DIPLOMA - CURRENT EQUIVALENTS
Advanced - AS-level and A-level, Level 3 NVQ, BTec Nationals and others
Intermediate - GCSEs grades A* to C, Intermediate GNVQ, Level 2 NVQ and others
Foundation - GCSEs grades D to G, Level 1 NVQ and others
Entry level - Entry level certificates
But classroom teachers' unions have expressed concern that their members' workloads might increase.
And Conservative spokesman Tim Collins said his party wanted to keep external assessment.
Employers also remain sceptical about the Tomlinson proposals.
Others have welcomed them, however.
"What I want from the government is strong support for the Tomlinson report - I don't want any fudge," said David Hart, general secretary of the National Association of Head Teachers.