Equally disturbing is the fact that soon there will be a shortage of qualified teachers.
He said it was estimated that 30% of newly qualified teachers left within the first five years.
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But many newly qualified teachers left the profession within the first few years because of stress and workload.
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This could mean lessons being delivered "under the leadership of a qualified teacher, but not only using qualified teachers".
Such schools retain well-qualified teachers for longer than do schools facing less choice.
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Reliable ethnicity data for the whole profession is not available, but 9% of newly qualified teachers were from non-white backgrounds.
Those schools get less funding and have less qualified teachers than average.
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One of the most serious issues is the shortage of well-qualified teachers, which is forcing many school districts to hire uncertified or underqualified people.
In fact, any two qualified teachers can start such a school and get such voucher payments for however many pupils they manage to attract.
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More than a fifth of Durham's newly-qualified teachers (22.3%) from last year were said to be still seeking a teaching post in January this year.
However, the proportion of men entering the profession has risen slightly, with men making up 25.6% of newly qualified teachers, up from 24% last year.
However, there was a slight fall in the proportion of successfully qualified teachers failing to get a job within six months of ending their course.
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One of the most significant factors in the provision of quality education outcomes in the Pacific is the shortage of certified and qualified teachers and principals.
However, the educational sector is still bedevilled by huge challenges, including shortages of qualified teachers, learning materials and classrooms as well as high rates of poverty.
Until last year, the figures, from the database of teacher records, showed a fall in the number of qualified teachers leaving the profession over the previous five years.
Just over half did not provide support to trainee or newly qualified teachers - and although many would have been willing to do so, almost one in five would not.
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Despite this, braille use has declined, in part due to a shift from specialized schools for people who are blind to mainstream schools where there are too few qualified teachers.
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Indeed, in places such as India that face massive underserved populations and a shortage of qualified teachers, it's hard to imagine making a dent without leveraging technology in a big way.
Schools needed to 'build on the creative use of teaching assistants' with schools using a mix of staff 'fulfilling complementary roles - qualified teachers alongside trained classroom assistants, learning mentors and technicians'.
Raising the issue of trained teachers in Pakistan, Mr. Qamar Zaman said that educated and professional teachers are mostly concentrated in cities and real challenge about qualified teachers is in rural and remote areas.
Mr Balls said that "in the first year of practice, we put social workers in situations without proper support and probation" that newly qualified teachers, police officers or doctors would never have to face.
These include the acute shortage of qualified teachers, financial resources and appropriate educational resources (such as school buildings and textbooks) as well as the failure of most parents to send their children to school due to poverty.
Minister for Children, Education and Lifelong Learning Leighton Andrews AM acknowledged the "critical lack of suitably qualified teachers within schools" and confirmed that there are some "systemic issues that we need to tackle in the education system".
Since then Ms Barton says she has focussed funding on hiring highly qualified teachers and on extra support for pupils who struggle with English and maths, including one to one tuition for those in danger of falling behind.
"The pressure to hire many new teachers to meet the goal of Universal Primary Education and replace teachers leaving the profession often lead to the recruitment of less qualified teachers or even to lower national standards, " adds Bernal.
Web-based instruction for teachers is one of the most important because it can be an extremely cost-effective way to train new teachers, and it may be the only way we can possibly fill the huge demand for qualified teachers.
If we do these things -- end social promotion, turn around failing schools, build modern ones, support qualified teachers, promote innovation, competition and discipline -- we will begin to meet our generation's historic responsibility to create 21st century schools.
They hire better-qualified teachers, and more of them, offering higher salaries to lure those with qualifications in difficult subjects such as physics, mathematics and foreign languages, and now have twice as many teachers per pupil as state schools do.
But a spokesperson for the Department for Education and Skills rejected the claim, saying that the number of qualified teachers was at its highest for 19 years and that many of the "non-qualified" teachers were often experienced overseas staff.
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An article published last November in Korea's JoongAng Daily said the country would recruit 100 teachers from India to work in rural areas where there is a shortage of English instructors and after failing to find qualified teachers from the West.
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