As a professor, Ayers has written more than a dozen books on his holistic approach to learning that downplays the boundaries between teacher and student.

CNN: 3,000 professors sign to support William Ayers

"What Wales needs is a holistic approach to education, where learning opportunities are expanded for students at school age, and further opportunities are provided for life long learning, " said a Plaid spokesman.

BBC: NEWS | UK | Wales | Labour accuses Plaid of 'U-turns'

The holistic vision of the programme is evident in the six learning strands within the Accreditation and Equivalency Sub-Programme, namely communication skills, critical thinking and problem-solving, sustainable use of resources and productivity, self-development, a sense of community and expanding one's world vision.

UNESCO: Education