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The Guardian's league table of universities came out on Monday evening, and we now know how every higher education institution in the UK performed in the past year.
Today (Tuesday) we release individual league tables for every subject taught at universities in the UK.
Some readers will want to know how it all works. What is the Guardian's special recipe for calculating the performance of universities – and how do our tables differ from those of other guides?
Others will be concerned to know how to use the tables to choose a place at university. Are the rankings the most important factor in deciding on a course?
From 12-2pm today, the compiler of the tables, Matt Hiely-Rayner from Intelligent Metrix, will be online to answer your questions and explain the lengthy process of consultation, categorisation and number-crunching that goes into putting these figures together each year.
Research has shown that the Guardian tables are the most popular in the country, and have a significant impact on which courses students apply for. So the release of the figures each year is a nail-biting time for many university planners.
While there is a lot of stability in the tables, some universities have leapt 10 or 20 places, others have seen their fortunes fall. Find out why by posting your questions below, and join in the discussion.
Guardian University Guide 2015
• University rankings in full
• How to use the tables
• The methodology
• The subject rankings
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