Each year since 2008, Australian school students in years 3, 5, 7 and 9 have been required to sit for a battery of standardised tests in literacy and numeracy. The tests bear the ubiquitous acronym NAPLAN, which stands for National Assessment Program — Literacy and Numeracy. Detailed individual student performance information is released to schools, and less detailed information is released to the public via the federal government’s My School website. One of the most interesting sets of data is the ‘like schools’ comparison, whereby a school’s results are compared with those of schools with a similar socioeconomic index (SEI). A more general ‘league table’ of results is also published and good results are regarded (unofficially) as a valuable marketing tool — in much the same way as year 12 results are used. Such was the case with Calista Girls' School, one of Australia’s most prestigious private schools.