Wu is sceptical about the importance of the National Assessment Program – Literacy and Numeracy (NAPLAN) and PISA results due to measurement errors acquired during collection of data.
[8] After the data was published on the website My School, Wu began to speak up about the misuse of standardised testing.
[10] Her findings were confirmed in 2018, when Les Perelman and Walt Haney reported that NAPLAN results of one million students should "be discarded".
[13] She developed two item response software programs that analyse PISA and TIMSS data; ACER ConQuest (1998) and the R-package TAM (2010).
She was one of several "acknowledged programmers", who were disproportionately women, who contributed significantly to highly cited manuscripts.