AQA set the papers and mark the scripts for around half of all GCSEs, AS and A-levels taken every year.
This summer, we've marked around 7 million scripts and will be awarding qualifications to around 1.4 million students.
With AS and A-level results out this Thursday, and GCSE results next week, here's our whistle-stop guide to setting, marking and grading exams.
The whole process for the summer 2016 exams began 18 months ago, when we started to develop the questions for our exams. This involves many teams of people including our in-house subject and assessment experts, as well as senior examiners. At the same time we also create the mark schemes – these are the examiners' guides for marking students' answers.
We know from our research that it's really important to have a clear, unambiguous mark scheme when you're creating a question paper to help ensure reliable marking.
The answer booklets – called 'scripts' – are marked by over 21,000 examiners, who are mostly current teachers. They'll mark the scripts either manually or on screen, depending on the subject. We train the examiners on how to use the mark scheme correctly and how to mark to the right standard.
We check samples of scripts as they're being marked to make sure examiners are marking accurately and consistently. We also set hidden 'test' questions for examiners marking on screen. This means that, if any examiner isn't getting it right, we can step in straight away – either providing more training, or giving the scripts to a different examiner to be marked.
We've got lots of other quality control systems in place to ensure the marking is tightly monitored, and we're constantly adding to these systems to make them even stronger.
No, not right away. Marking is just the first stage in the process and produces a total number of marks for each student's assessment. The second stage is 'awarding' – this is where we set the boundaries which will determine the grades that each student will be awarded.
The aim of awarding is to ensure that subject standards are maintained from one year to the next. To achieve this, we set grade boundaries for each written exam and each piece of controlled assessment/coursework/non-exam assessment.
Awarding is carried out by senior examiners, who are advised by AQA's own subject experts and research teams. The process is overseen by the qualifications regulator, Ofqual.
Once the exam scripts and controlled assessment/coursework/non-exam assessment materials for a subject have been marked, a group of senior examiners recommends the minimum mark – ie the boundary – for each grade.
Firstly, the senior examiners look at statistics, which show what the current group of students might be expected to achieve in the exam. Then they look at scripts from the previous year and the current year. They compare the scripts between the two years, and weigh up the statistical evidence and their own judgement to recommend the mark for the current year's boundary.
The final approval of all grade boundaries is made by an exam board's Accountable Officer – at AQA, this is our Chief Executive, Andrew Hall.
The standard is the same from year to year, even if the grade boundary is different. It's very difficult – probably impossible – to set papers of an identical level of demand each year. Setting a new grade boundary each year means we're being fair to all students. It wouldn't be fair if students got a lower grade just because they sat a more difficult paper, or got a higher grade because a paper was less difficult.
All exam boards currently use a process for awarding that is regulated by Ofqual. Basically, all things being equal, if the students taking exams in one year are of a similar ability to the students from the previous year, we would expect overall results to be similar. In the same way, if the students are of different ability, we would expect the overall results to be different.
We use statistics based on students' prior achievement to help us measure their ability, and therefore maintain the subject standards. This protects students during a period of change as it wouldn't be fair for a student to have an advantage or disadvantage simply because of which year he or she took an exam.
Once all the grade boundaries have been set, we issue a result for each student for each exam they have taken. We send the results electronically to schools and colleges in time for them to give to their students on results days – this year it's 18 August for AS and A-level results, and 25 August for GCSE results.
We also keep in close touch with UCAS to help the higher education admissions process run smoothly.
For more information, please watch our three short animations: