Headteachers in England have announced plans to publish their own school performance tables from this autumn.

The joint effort from the Association of School and College Leaders, the National Association of Head Teachers, the United Learning group and PiXL has emerged in response to what headteachers believe is a substandard system that does not reflect true school performance.

A website has already been launched by the partnership, which will allow schools to upload their full GCSE performance results in "unadulterated form so that parents can judge for themselves how local schools have performed".

The group explains that in contrast to what the Department of Education delivers, it will ensure that all schools have maximum and unedited transparency, thereby broadening and deepening "the scope of comparable information".

Eventually, this independent school league system will include data that goes beyond exam results – extracurricular provision, for example – provide parents with greater choice in the data they want to access and allow them to create unique measurements of success that fit in with their own ideas about quality education.

Jon Coles, chief executive of United Learning, said that when the government first introduced school league tables, it formed part of the Citizen's Charter. The intention was to provide people with information about public service performance.

"Making information about schools public was an important step to take," he continued. "Over time, though, the tables have become less a way of giving parents the information they want and more an arms-length policy lever by which successive governments have sought to influence the decisions heads take about how to run their schools."

Mr Coles stated that this is far too "crude an approach" when it comes to determining what characterises a high performing school and what does not. In fact, he went on to say, it has had a detrimental impact.

"For example, promoting too much focus on the C/D borderline, especially in English and maths, or promoting choices of qualification which do not serve individual children well," he outlined.

In response to the announcement, the government said that it has already started to make inroads in overhauling the current school league table system.

A spokesperson from the Department for Education explained that data will be clearer and schools will additionally be required to publish extensive information of their own websites.