"You'd have to think twice now about making the investment in time and effort" to compile factual material, he added.
Most of the detailed factual material learned in the sixth form is forgotten or superseded within a few years.
Where policy has to be settled over such matters as public health or education, statistical and factual material is needed.
"Proper science is not learning factual material at all," he said.
The role of knowledge in reducing drug use suggests continuing to disseminate factual material.
Security still thinks it's possible to extract factual material from situations of duress, but we know better.
But in this matter, she had little factual material to go on.
"You must give teachers that kind of factual material," she said.
Reviewing our resources, we've decided to try and influence the relatively large number of people who need something beyond simply factual material about green issues.
The text was submitted to the Prince's office for correction of factual material.