The government has been criticised over the publication of school league tables containing data relating to its new English baccalaureate qualification.
For the first time, the public has been shown the percentage of pupils at each school that gained GCSE A* to C-grades in maths, science, English, a language and a humanities subject last year.
Dr Mary Bousted, general secretary of the Association of Teachers and Lecturers, commented: "What complete nonsense today's league tables are. They don't give parents any of the information which they most need - the best school for their particular child and one in which their child will learn and thrive most."
She claimed that education secretary Michael Gove's idea of school accountability is "completely half-baked".
"No one except the geekiest geek could possibly have any use for the vast reams of data released," Dr Bousted added.
"And providing all this extra information is not going to help parents know who is responsible for any decisions about their children's education, as more and more players become involved in running schools."
Speaking earlier this week, Mr Gove said this is the most information parents have ever had about how well children are performing in England's schools.
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