unlucky83. That's an interesting question. We spent time on it in training. What are exams for?
Well, cynically, I think it's true to say that CSE was introduced to keep the - forgive my terminology - bottom end out of mischief when the school leaving age was raised. It was talked up as giving them a goal but in the days of pretty low unemployment the need to gain a few qualifications to get a blue-collar job was not an imperative. Believe it or not, there was even a special CSE for the really low achievers. I forget what it was called.
As someone above pointed out, the civil service required 5 grade Cs as, I believe, did nursing. Students going on to A levels and university obviously needed that all-important certificate. (It was desirable to have them all listed on the same certificate from the same exam board, unlike today when I needed DD to interpret her plethora of pieces of paper for me.)
Coursework done under exam conditions is, I believe, a true reflection of a student's real ability. It differs from a final exam taken in rows in the gym only in that the stress and group-panic is removed and there are more pieces completed in controlled conditions than are actually needed for final submission so poor work can be discarded.
You might say that the work therefore becomes easier, that standards are eroded from the outset and that teachers could nudge their pupils in the right direction in the classroom.
That was never the case. As I said earlier, we were extremely conscious that GCSE would lose credibility if we couldn't maintain the standard expected of an equivalent GCE grade. The work was not easier. It was actually far more varied and intellectually demanding than anything required for O Level. Pupils were being stretched all the time over 5 terms, we expected them to show progression during the course and class size for GCSE then for a compulsory subject like mine was typically 20 to 25 so there was no hiding place. Progress was monitored and predictions submitted to ensure we couldn't over mark. We checked each other's marking within the department and externally with other schools. I assume any coursework that is done today is similarly carefully assessed though I fear it might be computer marked half a world away.
Moreover, imagine the outcry if one of us had broken the rules of supervision in a controlled test? If I had leaned over and whispered to a pupil or given guidance in any way it would have been noticed and a parental complaint would have followed. It simply would not have been worth it.
There could have been a Hawthorne effect. We were fired up, we fired up our students, the new freedom of choice of texts and scope for innovation made us sharp. Yet the improvement continued year on year.
I can't speak for any other subject than my own. I wasn't better at English simply because I memorised chunks of Macbeth and Keats when I was 16. I would have been better if I had been allowed to worry less about that and had been enthused by the actual meaning. I won't dispute the need for facts in other subjects.