But more than the curriculum or organisation of classes, it is the teachers who are largely responsible for South Africa's abysmal results.

ECONOMIST: South Africa's education system

Teachers and students are both more effective in 10 or 15 student classes than in classes much larger.

FORBES: Why Fixing America's Schools Means Increasing Teacher Productivity

The visitors tried to ensure that teachers showed up to work, that classes took place, and that pupils received their textbooks more or less on time.

ECONOMIST: A fillip for South Africa��s schools