Why are there several exam boards, and how are they regulated?
Because qualifications in England are delivered by competing awarding organisations rather than by the state — a market structure, overseen by a regulator whose job is to ensure that the same grade means the same thing whichever board awarded it.
How it works. Several awarding organisations design specifications, set papers, mark them and issue certificates. Schools choose which board to use, and may use different boards for different subjects.
The regulator's role. Ofqual in England — with separate arrangements in Wales, Northern Ireland and Scotland — accredits qualifications, sets and enforces conditions of recognition, monitors standards between boards and over time, and can require boards to take action.
How comparability is maintained, which is the central technical problem:
Common subject content, specified centrally for GCSEs and A-levels so specifications cannot diverge substantially.
Comparable outcomes, using prior attainment data for the cohort to guide where grade boundaries fall — so grades reflect performance relative to a comparable national standard rather than the difficulty of one paper.
Inter-board scrutiny, comparing outcomes and investigating divergence.
The criticisms, which are substantive:
The incentive problem. Boards compete for schools, and schools understandably prefer specifications on which their students do well — creating at least a theoretical pressure toward leniency, which regulation exists to counteract. Whether it fully succeeds is argued.
Textbook and training revenue, where boards sell resources for their own specifications, has attracted scrutiny.
Error rates, since mistakes in papers occur and affect candidates unequally.
Complexity for schools in choosing between specifications.
What it means for candidates: boards differ in structure and assessment style but not in standard, so "an easier board" is not a meaningful advantage in the way people assume — the grade boundaries adjust.
Scotland's system is entirely separate, with a single national body.